Answer: The correct option is a) return to zero Explanation: When the switch S is closed, the galvanometer's pointer moves to the right. If S is closed, the magnetic field becomes constant, meaning...
Answer: The correct option is d) AC generator has slip rings while the DC generator has a commutator Explanation: So, the main distinction between AC and DC generators is that AC generators have...
Answer: The correct option is a) generator Explanation: A Generator is a device that produces an electrical current. Derived from a dynamo. A generator turns mechanical energy into electrical...
Answer: The correct option is c) producing induced current in a coil due to relative motion between a magnet and the coil Explanation: According to Faraday's Law of electromagnetic induction, a...
(a) 2. For the group 1 and 2, the number of valence electrons is equal to the group number and in the 2nd group, it is equal to 2. (b) 2. Valency is determined by the number of valence electrons...
The electronic configuration of nitrogen and phosphorous are as follows: N = (2,5) ; P = (2, 8, 5) Nitrogen will have more electronegativity because its atom has small size due to which the...
(a) Periods (b) Increases (c) Decreases (d) Increases (e) Decreases
(i) Elements in the same group have equal valency. (ii)The metallic character of elements in a period decreases gradually on moving from left to right.
Answer: The correct option is c) half revolution Explanation: As we know that E.M.F is given by: E=nωBAcosωt On every half-rotation, the direction of the induced current changes. As a result, the...
Answer: The correct option is c) magnetic effect of current. Explanation: A micro circuit breaker (MCB) works faster and more efficiently than a fuse to stop excessive current flow. When heated, an...
Answer: The correct option is d) MCB In place of fuses, MCBs are utilised in home wiring. When the current is high enough, the MCB's electromagnet separates the contacts and breaks the circuit.
Answer: Option (d) 2A is the most adequate answer. Explanation: Power P is equal to 240 watts. V = 240V is the voltage. We already know that power equals voltage times current. Maximum current drawn...
Answer: The correct option is b) a 13A fuse is the most appropriate value to use Explanation: Describing the relationship between the fuse rating and the fuse rating. FR=1.25×PV F R=1.25 \times...
Answer: The correct option is a) 5A We need a fuse with a current capacity somewhat higher than the device's maximum. According to the stated choice, the correct circuit fuse is 5 A, which is...
Answer: The correct option is b) switches, fuses, and circuit breakers should be placed in the neutral wire They should not be attached to the neutral wire because if they are, they would all burn...
Answer: The correct option is b) 5A Explanation: In regular use, a hair dryer draws 3.5 A. 1 to 1.5 are considered safe. So, for 4.2 A, the 5A fuse is safe.
Answer: The correct option is d) 30 Explanation Let n be the number of parallel tube lights that can be safely run. It is given that: Power of one tube-light, $P =40 W$ Therefore, Power of $n$...
Answer: The correct option is c) 10A Explanation: We need a fuse with a current capacity somewhat higher than the devices. So, 10 A is a little more than the device's current draw of 5.68 A.
Answer: The correct option is c) increases heavily Explanation: Because a short circuit increases the circuit's current, option c is the correct answer. A short circuit is an electrical circuit that...
Answer: e) It is not recommended to operate electric switches while the hands are wet, due to the fact that water is a good conductor of electricity, and we could receive an electric shock.
Answer: c) The following are the most critical safety precautions that should be followed at all times: i) Making use of high-quality cables ii) The use of proper earthing is also important. iii)...
Answer: a) The schematic diagram to show the domestic electric wiring from an electric pole to a room. b) As a result of using electricity, the following two dangers are related to the usage of...
Answer: a) For example, fuses installed in a residential electricity supply's fuse box protect the wiring of the house from an excessive current flow in the circuit. b) A fuse is a device that...
Answer: a) Given, P = 3kW = 3000W V = 240V As we know that, P = VI I = P/V Evaluating the value of current, I = 3000/240 I = 12.5A b) The size of the fuse that should be used in the geyser circuit...
Answer: To avoid lethal electric shocks, electrical gadgets have iron bodies. When the live wire touches the metallic case, a tremendous quantity of electricity passes through the user's body....
(a) Silver is the metal X. (a) When MX salt is exposed to light, chlorine is produced as a gas. (c) MX is the metal salt silver chloride that is employed in black and white photography. (d) Silver...
Solution: a) Given, V = 230V P = 750W T = 30/60 = 0.5 hours i) Let the maximum current be I As we know that, P = VI Evaluating value of current, 750 = 230I I = 3.26A ii) Electric energy consumed, E...
(a) Copper is the red-brown strip of metal X. (b) Silver nitrate is a colourless salt solution with the formula YNO3. (c) Silver is the metal that forms a shining white deposit on the strip metal X...
(a) Copper sulphate is be the salt formed named as XSO4. (b) The salt is blue in colour as it is copper sulphate (c) Copper sulphide is responsible for the black precipitate XS. (d) Chemical...
(a)Metal X is Copper and Metal Y is Sodium. Both produce sulphate salts on reaction. (b) XSO4 is Copper sulphate, CuSO4 , the salt formed which is blue in colour. (c) Y2SO4 is Sodium sulphate,...
Answer: a) As previously said, a fuse is considered to be one of the most significant devices that are used for protection in order to avoid the damages that can occur as a result of either an...
(a) Silver (Ag) is a conductor of electricity that does not produce hydrogen when exposed to dilute hydrochloric acid. (b) Silver nitrate (AgNO3) is XNO3 which reacts with NaCl (common salt) to give...
(a) Metal X is Copper (Cu) which is red-brown in colour and does not react with dilute acids. (b) Colorless gas Y2 is Hydrogen (H2). (c) Compound XO, a black metal compound is a Copper oxide (CuO)...
Answer: a) When the current exceeds the safe limits, the fuse wire melts and breaks the circuit. This is called a fuse turned off. b) Given, V = 220V I = 5A Let the maximum number of bulbs be y...
(a) Zn undergoes displacement reaction and is also used for galvanization. The evidences suggest that metal X is Zinc (Zn). (b) Copper is more reactive than Zn and displaces it while interacting....
Answer: A short circuit occurs when the live wire comes into touch with the neutral wire, which is a dangerous situation. It is known as overloading when more than two electrical appliances with a...
(a) The formation of water as a result of a reaction involving hydrogen burning in oxygen gas is a type of combination reaction. (b) The decomposition reaction takes place in the second case...
Answer: Cartridge fuses are used in automobile stereos. An inner glass tube T contains a tiny fuse wire. There are metal caps on the glass tube. The metal cap connects the two fuse ends. These metal...
(a) Lead salt here is Lead nitrate. (b) Brown fumes are produced due to the production of Nitrogen dioxide. (c) Chemical equation for the reaction involved is: 2Pb(NO3)2→ 2PbO + 4NO2
(a) Ferrous sulphate. (b) Decomposition reaction. Anhydrous ferrous sulphate is formed when a ferrous sulphate crystal loses water. It decomposes into ferric oxide, sulphur dioxide, and sulphur...
Answer: a) Fuse wire is made of tin-plated copper, which has a low melting point. b) Pure copper has a high melting point, making it harder to melt during short circuits.
![\[\mathbf{Mg}\left( \mathbf{s} \right)\text{ }+\text{ }\mathbf{CuO}\left( \mathbf{s} \right)~\to \mathbf{MgO}\left( \mathbf{s} \right)\text{ }+\text{ }\mathbf{Cu}\text{ }\left( \mathbf{s} \right)\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-6f995beaa02cb60c6c6f41fd202b467a_l3.png "Rendered by QuickLaTeX.com")
The answer is option(c). Because magnesium is oxidised here and copper is reduced, a redox reaction. Also, Magnesium being more reactive displaces copper in the solution. As a result, displacement...
![\[\mathbf{KBr}\text{ }\left( \mathbf{aq} \right)\text{ }+\text{ }\mathbf{AgN}{{\mathbf{O}}_{\mathbf{3}~}}\left( \mathbf{aq} \right)\text{ }\to \text{ }\mathbf{KN}{{\mathbf{O}}_{\mathbf{3}~}}\left( \mathbf{aq} \right)\text{ }+\text{ }\mathbf{AgBr}\text{ }\left( \mathbf{s} \right)\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-1426359ca96caabcf611532f6230d500_l3.png "Rendered by QuickLaTeX.com")
Option (c) is the correct response. The given reaction is a type of double displacement reaction, in which ions are exchanged between both the reactants.
Option (c) is the correct answer. A decomposition reaction is a reaction in which reactants break down into simpler products. Here, silver chloride is the substance that can be decomposed by the...
Option (d) is the correct response. The food we eat is digested and converted into energy during digestion. Carbohydrate-rich foods are broken down into glucose, which then combines with oxygen to...
![\[\mathbf{4M}\text{ }+\text{ }\mathbf{3}{{\mathbf{O}}_{\mathbf{2}}}\to \text{ }\mathbf{2}{{\mathbf{M}}_{\mathbf{2}}}{{\mathbf{O}}_{\mathbf{3}}}\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-b55903fe466d8c12a229da84a4a44476_l3.png "Rendered by QuickLaTeX.com")
Option (d) is the correct response. Metal combines with oxygen to produce a single compound in the above reaction. This is a type of combination reaction, and since oxygen is added, thus it is an...
![\[\left( \mathbf{a} \right)\text{ }\mathbf{Ba}{{(\mathbf{N}{{\mathbf{O}}_{\mathbf{3}}})}_{\mathbf{2}}}\mathbf{solution}\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-50da9bbc9460443f2e88d01ecb83dbc3_l3.png "Rendered by QuickLaTeX.com")
![\[\left( \mathbf{b} \right)\text{ }\mathbf{KN}{{\mathbf{O}}_{\mathbf{3}}}~\mathbf{solution}\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-b0c35f69d350ff362bf0b0da57705207_l3.png "Rendered by QuickLaTeX.com")
![\[\left( \mathbf{c} \right)\mathbf{AgN}{{\mathbf{O}}_{\mathbf{3}}}\mathbf{solution}\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-a1419bea63bda4ead8c43a88602a7240_l3.png "Rendered by QuickLaTeX.com")
![\[\left( \mathbf{d} \right)\text{ }\mathbf{Mg}{{(\mathbf{N}{{\mathbf{O}}_{\mathbf{3}}})}_{\mathbf{2}}}~\mathbf{solution}\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-08e89344a0a4ccac9e6363e81f42a6d7_l3.png "Rendered by QuickLaTeX.com")
Option (c) is the correct response. When we add common salt to silver nitrate, a precipitation reaction occurs to give a white precipitate.
Option (c) is the correct answer. When dilute sulphuric acid reacts with barium chloride, barium sulfate is produced along with HCl gas. The resulting barium sulfate is a white, insoluble precipitate.
Option (c) is the correct response. Food items packed in plastic bags in a nitrogen gas atmosphere do not get spoiled since nitrogen is an inert gas that does not react with the items. This is done...
Option (c) is the correct response. Corrosion occurs when iron metal combines with water and oxygen to generate hydrated oxide. This is a combination reaction and also an oxidation reaction since...
Option (a) is the correct response. Redox reactions involve both reduction and oxidation, with reduction involving the addition of hydrogen and oxidation involving the removal of hydrogen.
Option (c) is the right answer. The process of removing oxygen from a substance and replacing it with hydrogen is known as reduction. It occurs when the rate of atom oxidation drops.
(a) When barium chloride solution is mixed with sodium sulphate solution, a white barium sulphate precipitate forms along with the sodium chloride solution. Na2SO4 + BaCl2 → BaSO4 + 2NaCl (c) Solid...
Answer: a) Live b) Body. Explanation: a) If the fuse is linked to a neutral wire rather than a live wire, and the fuse blows, the appliances remain connected to the live wire and the current...
Answer: The parallel connection should be used to connect all of the bulbs in a structure.
Answer: Two reasons exist for connecting electrical appliances in parallel in a household circuit: a) When connected in parallel, when one stops working, the others continue to work. b) All...
Answer: Generally speaking, the primary goal of earthing electrical equipment is to reduce the possibility of electric shocks.
Answer: a) Red is the colour of live wire b) Black wire is used for the neutral wire. c) The green earth wire serves as the grounding line.
Answer: Following are the three colours that are used in an electric appliances: a) Red b) Black c) Green
Answer: To safeguard the circuit from overcurrent, fuses are always connected in series. A blown fuse will open the circuit and stop the flow of current.
Answer: Live wire Switches are installed in the live wire to allow an electrical device to be turned off and on. Switches are used to connect an electrical device to the main power supply. As long...
Answer: In order for a short circuit to occur, the live wire and the neutral wire must come into direct contact with one another.
Solution: Given, P = 180W V = 240V As we know that, P = VI Thus, evaluating the value of I I = P/V = 180/240 = 0.75 A Because of this, the fuse wire should be capable of withstanding currents up to...
Answer: The electric potential of the neutral wire in a mains supply cable is zero volts. In an AC circuit, the neutral wire serves as a return path for the passage of electricity. The neutral wire...
Answer: The three wires of the cable that connects to the plug of an electric iron are colored as follows: red, black, and blue. a) Red wire: This is a live wire. b) The black wire is the neutral...
Answer: The earth wire, which is used in conjunction with the live wire and neutral wire, is the third wire that is employed.
Answer: a) False Explanation The electric power line enters our house via three wires: live, neutral, and earth. The first two transport electricity from the power plant, while the third is earthed...
The circuit diagram uses the following symbol for an electric fuse:
Answer: Following is the usual capacity of an electric fuse that is used in: a) 5A b) 15A It is a stated fact.
Answer: The term "electric fuse" refers to the device that is used to automatically switch off the electricity supply when a short circuit occurs in the domestic wiring.
Answer: a) As a general rule, direct current is used to refer to the current that flows in just one direction, and alternating current is used to refer to the current that flows in both directions...
Answer: a)Electricity is produced by electromagnetism, which is referred to as electromagnetic induction. The wire AB should be moved upwards between the poles of the horseshoe magnet so that it is...
Answer: Construction: A rectangular coil ABCD is rapidly rotated between the north and south poles of a powerful horseshoe magnet. A permanent magnet M is utilised. The coil with several twists is...
a) When it comes to the building of both the DC and the AC generators, the ends of both generator coils are connected to the outer circuit. A DC generator is comprised of two half rings of copper...
Answer: a) Fleming's right-hand rule: The thumb, forefinger, and middle finger of the right hand are parallel. The thumb indicates conductor velocity, the forefinger the magnetic field, and the...
Answer: The direction of induced current in a magnetic field is given by Fleming's right-hand rule. The right thumb, forefinger, and center finger must be held at right angles. The forefinger shows...
Answer: a) i) The distinction between alternating current and direct current is that alternating current can flow in both directions. ii) DC current's value and direction remain constant while AC...
Answer: a) An electric generator works by moving a straight conductor in a magnetic field, causing current to flow. b) Current is induced in a generator's coil in the following ways: i) Faster coil...
Answer: Because of the shift in the magnetic field caused by the placement of coils B and C in close proximity to each other, the other coil will experience some current induced into it....
Answer: A generator with a commutator produces a direct current.
Answer: The three primary sources of magnetic field generation are as follows: Permanent magnet Electromagnets A conductor that transports current.
Answer: Heat-generating plants, such as thermal power plants, are typically placed near rivers because they require a large and consistent supply of water in order for water to be transformed into...
Answer: To convert an alternating current generator into a direct current generator, the slip rings must be replaced with a commutator.
Answer: An unstable potential difference is produced by an alternating current generator. E.g. A coil of wire moving in a magnetic field is an ac generator. At power plants, alternating current...
Answer: The movement of the wire in relation to the magnet is a necessary condition for the generation of current through electromagnetic induction to occur.
In the Modern Periodic Table, the element calcium has an atomic number 20, so it has 2, 8, 8, 2 electronic configurations. Therefore, this two valance electron containing element is identical to the...
In the Modern Periodic Table, the electronic configuration of an element determines the number of valence electrons whereas the position of the atom is determined by the valence electrons.
Nitrogen: Atomic number - 7 Electronic configuration - 1s2 2s2 2p3 Nitrogen: Atomic number - 15 Electronic configuration - 1s2 2s2 2p6 3s2 3p3 The number of shell increases in the periodic table...
Group 16 Group 17 - - - A - - B C (a) State whether A is a metal or non-metal. (b) State whether C is more reactive or less reactive than A. (c) Will C be larger or smaller in size than B?...
(a)The element is Chlorine (Cl) and the atomic number of chlorine is 17. (b) The atom with the electronic configuration of 2, 8, 7 which is the chlorine is chemically identical to Fluorine (F) which...
(a) All the elements are in the same boron column (group 13). Thus, they have three electrons in their valence shells. Besides, non-metallic boron, all other elements (i.e., aluminum, gallium,...
(a) Neon (Ne) has two shells in which both are completely filled with electrons. (b) Magnesium (Mg) has the electronic configuration 2, 8, 2. (c) Silicon (Si) has a total of three shells, with four...
Identification: Element X - Magnesium (Mg) containing valency of 2. Explanation: When Mg is combined with chloride (Cl), it forms Magnesium Chloride (MgCl2).
Correct Answer: (c) The atoms lose their electrons more easily Explanation: Atoms do not lose their electrons easily because as we move from left to right across the periodic table, the non-metallic...
The elements that are expected to have the most metallic character are Be and Ga. The tendency to lose electrons is greater in Ga than the Be as the size of Ga is bigger. Thus, the element Ga have...
The metals among the first ten elements in the modern periodic table are, Lithium Beryllium
(a) Lithium, sodium, potassium are the metals that are unstable because of the unfilled outermost shells. This is the reason that they react with water in order to release hydrogen and these metals...
Lithium (Li), Sodium (Na) and potassium (k) are the three elements that have only one electron in their outermost shells. Magnesium (Mg) and Calcium (Ca) are the two elements that contains...
I think that the elements Calcium and Beryllium are expected to show chemical reactions that are similar to the element magnesium as these elements belong to the same group having 2 valence...
The Modern periodic table is arranged in order of their atomic number. This removes inconsistencies in relation to certain pairs of the elements present in the Mendeleev’s periodic table. The atomic...
The noble gases have been classified as separate group because of their inert nature as they are also called as inert gases. Noble gases are present in low concentration in our atmosphere. They are...
Mendeleev focused on a variety of chemicals made up of elements containing Hydrogen and Oxygen. Among the material, he saw the interrelationships between the mass of many atoms of various elements...
The elements that are left by the Mendeleev’s Periodic Table besides gallium are, Germanium Scandium
According to the Mendeleev’s Periodic Table, Potassium (K) belongs to group IA with a valency of 1. Formula - K2O Carbon (C) belongs to group IV A with a valency of 4. Formula - C2O4 or CO2 Aluminum...
Limitations of Newlands’ Law of Octaves: Newlands Octave law applies only to the elements till Calcium. Newland estimates that there are a total of 56 elements in nature and that there are no more...
Mendeleev’s Periodic Table Modern Periodic Table In the Mendeleev’s Periodic Table, the arrangement of the elements are according to the increasing order of the element’s atomic mass. In the Modern...
Limitations of Döbereiner’s classification: They do not work at elements which have very low or high mass. All elements could not fit into Dobereiner's traids. As the methods of calculating the...
There is a lot of dirt and contaminants mixed with water, and most of all the impurities do not dissolve in the water. Soap molecules are a mixture of salts such as sodium or potassium. Molecules...
The Bromine Water Testing is used to distinguish between unsaturated chemicals such as alkenes and alkynes and saturated chemicals. For this purpose, bromine is used in the form of water. The...
The hydrocarbons that undergo addition reactions are: C3H6 C2H2
Hydrogenation is the process or chemical reaction between hydrogen and other chemicals. It is usually done in the presence of catalysts like for example nickel, palladium or platinum. Hydrogenation...
When soap is dissolved in water, due to the formation of alkaline NaOH or KOH, the solution is also alkaline. The solution turns red litmus into blue, but in soap solution, blue litmus do not change...
A scrum is produced by a reaction of hard water with soap. The calcium and magnesium present in hard water form an insoluble white precipitate (scrum).
Carbon and its compounds used as fuel for many applications because they have high calorie values and provide a lot of energy. Most carbon dioxide emits a lot of heat and light when burned in the...
Micelle formation occurs due to contaminated particles in water and fresh water. There are two departments involved: one is pure water and the other is impurities. Soap also has two modes (organic...
Ethanol Ethanoic acid Ethanol do not react with sodium hydrogen carbonate Ethanoic acid reacts with sodium hydrogen carbonate Ethanol has a good smell and a burning taste Ethanoic acid has a vinegar...
A homologous series is a series of chemical compounds having same functional group, general formula and chemical properties. As there is a change in physical structures, we can say that there will...
(a) Electron dot structure of ethanoic acid: (b) Electron dot structure of H2S: (c) Electron dot structure of propanone: (d) Electron dot structure of F2:
Carbon cannot lose four electrons or gain four electrons as these processes make the system unstable due to the need for additional energy. CH3Cl therefore eliminates its octet suspension by sharing...
Correct Answer: (b) the fuel is not burning completely Explanation: While cooking, if the bottom of the vessel is dark outside it shows that the fuel is not completely burning.
Correct Answer: (c) ketone Explanation: Butanone, also known as methyl ethyl ketone, is an organic chemical compound manufactured on a large scale, but only happens in the environment by tracing.
Correct Answer: (b) 7 covalent bonds Explanation: Ethane is the simplest hydrocarbon containing a single carbon-carbon bond. The second most important source of natural gas, it is also dispersed in...
Usually, agitation is necessary to obtain clean clothes such as agitation aid soap micelles to hold oil, grease or any other impurities to be removed. When the clothes are agitated or beaten, the...
It is impossible to check whether the water is hard by using a detergent because the detergents are made of ammonium salts or long carboxylic acid sulphonates. Unlike soaps do not work with calcium...
Oxidising agents are compounds that remove Hydrogen or add oxygen to a mixture. Eg: halogen, potassium nitrate, and nitric acid.
In reaction with Sodium Carbonate, Carboxylic acid produces carbon dioxide gas which converts lime water into a milky form and alcohol does not give this reaction. This test can be used to separate...
The mixture of oxygen and ethyne is heated instead of a mixture of ethyne and air because heat production is very important in heating metals. When oxygen and ethyne burn, they completely burn to...
The conversion of ethanol to ethanoic acid involves the removal of the Hydrogen atom and the addition of oxygen (oxidation reaction). In the first step, the Hydrogen molecule is removed from ethanol...
1. CH3—CH2—Br 2. 3. Answers: 1. Bromoethane 2. Methanal or Formaldehyde 3. 1 – Hexyne
(i) Ethanoic acid: (ii) Bromopentane: (iii) Butanone: (iv) Hexanal:
Formula and Electron dot structure of cyclopentane:
Carbon has six electrons in valence which is actually the highest number of valency. The Covalent bond occurs easily with carbon atoms and many others such as oxygen, chlorine, nitrogen, sulfur,...
1. n-pentane: 2. 2-methylbutane: 3. 2, 2-dimethylpropane:
Electron dot structure of a molecule of Sulphur:
Electron dot structure of carbon dioxide (CO2):
(a)Rancidity is the result of the slow oxidation of oil and fat found in food products, which produces a bad odour and taste. When fats and oils oxidise, the food turns rancid, which affects the...
Corrosion is a natural process that gradually degrades things in the environment through chemical or electrochemical reactions. Corrosion happens when the majority of all of the atoms on a metal...
When a strip of zinc metal is immersed in copper sulphate solution, zinc sulphate solution and copper are obtained. (a) The chemical equation for the reaction mentioned above is as follows:-...
When silver chloride is exposed to light, it decomposes into silver metal and chlorine gas, which is a photolytic breakdown reaction. The chemical equation for this reaction is as follows:- 2AgCl(s)...
When silver nitrate solution is added to sodium chloride solution, a white silver chloride precipitate forms along with the sodium nitrate solution. (a) The chemical equation for the reaction is:-...
(a) Magnesium sulphate solution and copper metal are produced when a piece of iron metal is immersed in a copper sulphate solution. This is an example of a displacement reaction. CuSO4 + Fe →...
(a) Decomposition reactions are reactions that split or break substances into two simpler components. When calcium carbonate is heated, it decomposes into calcium oxide and carbon dioxide. This is...
(a) A displacement reaction occurs when one active element removes a less reactive ingredient from a salt solution. 2KI + Cl2 → 2KCl + I2 b) A double displacement reaction occurs when two ionic...
Oxidation is the removal of hydrogen and reduction is the addition of hydrogen. This is demonstrated by an example as foloows: Fe2O3 + 3CO → 2Fe + 3CO2 In the reaction above, Fe got reduced while...
(a) Oxidation is the addition of oxygen while reduction is the removal of oxygen. H2S + Cl2→ S + 2HCl In the reaction shown above, hydrogen is removed from hydrogen sulphide, so it is an oxidation...
(a) A displacement reaction occurs when a more reactive ingredient displaces a less reactive element out of its compound. The displacement reaction involves both metals and non-metals. An example of...
(a) 2Cu + O2 → 2CuO (in the presence of heat) Copper oxide is formed when copper reacts with oxygen in an oxidation-reduction reaction. (b) CuO + H2→ Cu + H2O Dihydrogen oxide is formed when...
ZnO + C → Zn + CO (i) An oxidizing agent is a reactant that gains electrons and undergoes reduction during a redox reaction. In the reaction shown above, the oxidizing agent is zinc oxide as it...
A decomposition reaction occurs when a substance is broken down or split into two or more components. They are divided into three categories. Thermal decomposition, electrolytic decomposition, and...
(a) Ferrous sulphate crystals are green in colour but their colour changes to white when heated. This is because the water in the crystals evaporates and anhydrous ferrous sulphate is produced,...
(a) An endothermic process is one in which heat is absorbed during the reaction. For example, burning carbon in the presence of oxygen produces carbon dioxide and releases a significant quantity of...
A redox reaction is a reaction when both oxidation and reduction take place simultaneously. An example for a redox reaction is as follows:- SO3(aq) + MnO4(aq) → SO4(aq) + Mn Here, Sulphur trioxide...
Oxidation is the process of losing an electron by an atom. Alternatively, oxygen can be added to a substance to raise the fraction of oxygen in its molecule. Oxidation can even be accomplished...
Answer: Electromagnetic induction is the term used to describe the phenomena in which current is switched on and off in a coil in order to induce a current in another coil.
Answer: Electromagnetic induction is the term used to describe the phenomena in which a wire moves up and down in a magnetic field in order to generate a current in the wire.
Answer: Among their many functions, the brushes of an electric generator are responsible for transferring electricity from the coil to the load.
Answer: a) True Explanation: A generator produces electricity by rotating a coil in a magnetic field. An electric generator (dynamo) turns mechanical energy into electrical energy. Generators do not...
Answer: To convert an alternating current generator into a direct current generator, the slip rings must be replaced with a commutator.
Answer: At power plants, alternating current generators are used.
Answer: The movement of the wire in relation to the magnet is a necessary condition for the generation of current through electromagnetic induction to occur.
Answer: Fleming's right-hand rule is employed in order to determine the direction of the induced voltage.
Answer: Electromagnetic induction is a phenomenon that is used in the production of electricity by electric generators.
Answer: a) A commutator is used by a direct current generator. b) Slip rings are used by the alternating current generator (AC generator).
Answer: Electric generators are devices that are used to transform mechanical energy into electrical energy. They are also known as power generators.
Answer: (a) Oxidation; reduction. (b) Reduction; oxidation. (c) Rancidity.
![\[\mathbf{S}{{\mathbf{O}}_{\mathbf{2}}}~+\text{ }\mathbf{2}{{\mathbf{H}}_{\mathbf{2}}}\mathbf{S}\text{ }\to \text{ }\mathbf{2}{{\mathbf{H}}_{\mathbf{2}}}\mathbf{O}\text{ }+\mathbf{3S}\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-f253585babb374c2b6e61729cf8a446f_l3.png "Rendered by QuickLaTeX.com")
SO2 + 2H2S → 2H2O +3S In the reaction above, H2S got oxidized as Hydrogen was removed from the molecule while SO2 got reduced because Oxygen was removed.
![\[{{\mathbf{H}}_{\mathbf{2}}}\mathbf{S}\text{ }+\mathbf{C}{{\mathbf{l}}_{\mathbf{2}}}\to \text{ }\mathbf{S}\text{ }+\mathbf{2HCl}\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-5a825f6d792d8b4bee77b84ccd034b34_l3.png "Rendered by QuickLaTeX.com")
H2S is oxidized in the above reaction as Hydrogen is being removed from H2S to release sulphur.
![\[\mathbf{PbS}\left( \mathbf{s} \right)\text{ }+\text{ }\mathbf{4}{{\mathbf{H}}_{\mathbf{2}}}{{\mathbf{O}}_{\mathbf{2}}}\left( \mathbf{aq} \right)\text{ }\to \text{ }\mathbf{PbS}{{\mathbf{O}}_{\mathbf{4}}}\left( \mathbf{s} \right)\text{ }+\mathbf{4}{{\mathbf{H}}_{\mathbf{2}}}\mathbf{O}\left( \mathbf{l} \right)\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-9da3bbdbcec1b52f5114c4f9aade8a63_l3.png "Rendered by QuickLaTeX.com")
(a) H2O2 is reduced. (b) PbS is oxidised.
![\[\left( \mathbf{a} \right)\text{ }\mathbf{CaO}\text{ }+\text{ }\mathbf{C}{{\mathbf{O}}_{\mathbf{2}}}\to \text{ }\mathbf{CaC}{{\mathbf{O}}_{\mathbf{3}}}\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-0a64bd62fb54bbd0edf1b63b6683ee24_l3.png "Rendered by QuickLaTeX.com")
![\[\left( \mathbf{b} \right)\text{ }\mathbf{2Na}\text{ }+\mathbf{2}{{\mathbf{H}}_{\mathbf{2}}}\mathbf{O}\text{ }\to \text{ }\mathbf{2NaOH}\text{ }+{{\mathbf{H}}_{\mathbf{2}}}\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-ca02eab857f32a5212e1bec9e28dde03_l3.png "Rendered by QuickLaTeX.com")
![\[\left( \mathbf{c} \right)\text{ }\mathbf{Mg}\text{ }+\text{ }\mathbf{CuS}{{\mathbf{O}}_{\mathbf{4}}}\to \text{ }\mathbf{MgS}{{\mathbf{O}}_{\mathbf{4}}}~+\text{ }\mathbf{Cu}\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-1fc4d1026bbc1af1b8dabbefee1e3766_l3.png "Rendered by QuickLaTeX.com")
![\[\left( \mathbf{d} \right)\text{ }\mathbf{N}{{\mathbf{H}}_{\mathbf{4}}}\mathbf{N}{{\mathbf{O}}_{\mathbf{2}}}\to \text{ }{{\mathbf{N}}_{\mathbf{2}}}~+\mathbf{2}{{\mathbf{H}}_{\mathbf{2}}}\mathbf{O}\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-ec63045a06b69bdeacca721fae9d3a06_l3.png "Rendered by QuickLaTeX.com")
![\[\left( \mathbf{e} \right)\text{ }\mathbf{CuS}{{\mathbf{O}}_{\mathbf{4}}}~+\text{ }\mathbf{2NaOH}\text{ }\to \mathbf{Cu}{{\left( \mathbf{OH} \right)}_{\mathbf{2}}}~+\mathbf{N}{{\mathbf{a}}_{\mathbf{2}}}\mathbf{S}{{\mathbf{O}}_{\mathbf{4}}}\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-66adb56ae15b498d389cdc9659a64a2f_l3.png "Rendered by QuickLaTeX.com")
(a) Combination reaction, since calcium oxide combines with carbon dioxide to calcium carbonate. (b) Displacement reaction, since sodium replaces oxygen to give sodium hydroxide. (c) Displacement...
![\[\left( \mathbf{a} \right)\text{ }\mathbf{C}{{\mathbf{l}}_{\mathbf{2}~}}+\mathbf{2KI}\text{ }\to \text{ }\mathbf{2KCl}\text{ }+{{\mathbf{I}}_{\mathbf{2}}}\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-4dc4be4dcdc2a604694c564896fcc2aa_l3.png "Rendered by QuickLaTeX.com")
![\[\left( \mathbf{b} \right)\text{ }\mathbf{2K}\text{ }+\text{ }\mathbf{C}{{\mathbf{l}}_{\mathbf{2}~}}\to \text{ }\mathbf{2KCl}\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-7c0994c2a89c00e7940167bc34f57534_l3.png "Rendered by QuickLaTeX.com")
(a) Displacement reaction, since Chlorine replaces Iodine to combine with POtassium to give Potassium chloride. (b) Combination reaction since Potassium and chloride combine to form two molecules of...
![\[\left( \mathbf{a} \right)\text{ }\mathbf{FeS}{{\mathbf{O}}_{\mathbf{4}}}\to \text{ }\mathbf{F}{{\mathbf{e}}_{\mathbf{2}}}{{\mathbf{O}}_{\mathbf{3}}}~+\text{ }\mathbf{S}{{\mathbf{O}}_{\mathbf{2}}}~+\text{ }\mathbf{S}{{\mathbf{O}}_{\mathbf{3}}}\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-39a391e2efc0e61cf16f7278f41bd043_l3.png "Rendered by QuickLaTeX.com")
![\[\left( \mathbf{b} \right)\text{ }\mathbf{Pb}{{\left( \mathbf{N}{{\mathbf{O}}_{\mathbf{3}}} \right)}_{\mathbf{2}}}\left( \mathbf{s} \right)\text{ }\to \mathbf{PbO}\left( \mathbf{s} \right)\text{ }+\text{ }\mathbf{N}{{\mathbf{O}}_{\mathbf{2}}}\left( \mathbf{g} \right)\text{ }+\text{ }{{\mathbf{O}}_{\mathbf{2}}}\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-d80c527fb417f074f02fec6a6299e69f_l3.png "Rendered by QuickLaTeX.com")
The given chemical equations have been balanced as follows: (a) 2FeSO4→ Fe2O3 + SO2 + SO3 In this reaction, Ferrous sulphate decomposes to give Ferric oxide. Sulphur dioxide and sulphur trioxide....
(i) Displacement reaction, since A replaces B to combine to C giving AC. (ii) Combination reaction since A and B combine to give a product C which is different from both the reactants. (iii)...
(a) Combination reaction, since magnesium reacts with oxygen in this reaction. (b) Decomposition reaction, since on heating limestone decomposes to give calcium oxide and carbon dioxide. (c)...
![\[\left( \mathbf{i} \right)\text{ }\mathbf{CaC}{{\mathbf{O}}_{\mathbf{3}}}\to ~\text{ }\mathbf{CaO}\text{ }+\text{ }\mathbf{C}{{\mathbf{O}}_{\mathbf{2}}}\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-0c92930afac1ec5967f99a1ab56a8bb7_l3.png "Rendered by QuickLaTeX.com")
![\[\left( \mathbf{ii} \right)\text{ }\mathbf{CaO}\text{ }+\text{ }{{\mathbf{H}}_{\mathbf{2}}}\mathbf{O}\text{ }\to ~\text{ }\mathbf{Ca}{{\left( \mathbf{OH} \right)}_{\mathbf{2}}}\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-09a5e04c0d57cc97c3ed951a5fda53fb_l3.png "Rendered by QuickLaTeX.com")
![\[\left( \mathbf{iii} \right)\text{ }\mathbf{2FeS}{{\mathbf{O}}_{\mathbf{4}}}\to ~\mathbf{F}{{\mathbf{e}}_{\mathbf{2}}}{{\mathbf{O}}_{\mathbf{3}}}~+\text{ }\mathbf{S}{{\mathbf{O}}_{\mathbf{2}}}+\text{ }\mathbf{S}{{\mathbf{O}}_{\mathbf{3}}}\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-8017c8e89d01e684bcf61c0f1de70693_l3.png "Rendered by QuickLaTeX.com")
![\[\left( \mathbf{iv} \right)\text{ }\mathbf{N}{{\mathbf{H}}_{\mathbf{4}}}\mathbf{Cl}\text{ }\to ~\text{ }\mathbf{N}{{\mathbf{H}}_{\mathbf{3}}}~+\text{ }\mathbf{HCl}\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-dfa6e7a26dfa378a6a20c25533177fab_l3.png "Rendered by QuickLaTeX.com")
![\[\left( \mathbf{v} \right)\text{ }\mathbf{2Ca}\text{ }+\text{ }{{\mathbf{O}}_{\mathbf{2}}}\to ~\text{ }\mathbf{2CaO}\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-4190dac4b3d24fa80d042d143aeff889_l3.png "Rendered by QuickLaTeX.com")
Answer: (i) Decomposition reaction, since calcium carbonate decomposes to gove calcium oxide and carbon dioxide in the reaction. (ii) Combination reaction, since Calcium oxide combines with water to...
(a) There would be no greenhouse effect if there was no atmosphere. As a result, the earth's temperature would plummet. (b) Smoke clouds from a worldwide nuclear war might potentially cover large...
(a) X-rays are absorbed by the atmosphere, although visible and radio waves can get through. (b) The ozone layer absorbs ultraviolet energy from the sun, preventing it from reaching the earth's...
(a) Ionosphere reflects waves in the shortwave bands. (b) The frequency and energy of television transmissions are both high. As a result, the ionosphere does not fully reflect it. The TV...
[energy of a particular transition in 
Fe nucleus associated with a famous high resolution spectroscopic method (Mössbauer spectroscopy)].X-rays region
[temperature associated with the isotropic radiation filling all space-thought to be a relic of the ‘big-bang’ origin of the universe].
– 
[double lines of sodium](a) Microwave (b) Visible light
(wavelength emitted by atomic hydrogen in interstellar space).
(frequency of radiation arising from two close energy levels in hydrogen; known as Lamb shift).(a) Radio waves (b) Radio waves
to obtain the characteristic temperature ranges for different parts of the electromagnetic spectrum. What do the numbers that you obtain tell you?The given equation is, $\lambda_{\mathrm{m}} \mathrm{T}=0.29 \mathrm{~cm} \mathrm{~K}$ $\Rightarrow \mathrm{T}=\left(0.29 / \lambda_{\mathrm{m}}\right) \mathrm{cm} \mathrm{K}$ where, $T$ is the...
of the power of a 
light bulb is converted to visible radiation. What is the average intensity of visible radiation.
from the bulb?
? Assume that the radiation is emitted isotropically and neglect reflection.(a) Average intensity of the visible radiation is given by the expression, $I=P^{\prime} / 4 \pi d^{2}$ So, the power of the visible radiation will be $P^{\prime}=(5 / 100) \times 100=5 \mathrm{~W}$...
![\left.\mathrm{N} / \mathrm{C}) \cos \left[(1.8 \mathrm{rad} / \mathrm{m}) \mathrm{y}+\left(5.4 \times 10^{6} \mathrm{rad} / \mathrm{s}\right) \mathrm{t}\right]\right\}^{\wedge} \mathrm{i}](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-aa0dc5ee496338ec62b17ccfc2c0969c_l3.png "Rendered by QuickLaTeX.com")
. Write an expression for the magnetic field part of the wave.Magnetic wave is directed along the negative z-direction. Thus, B = Bocos(ky+ωt)k $B_{z}=B_{0} \cos (k y+\omega t)^{2} k=\left{(10.3 \mathrm{nT}) \cos \left[(1.8 \mathrm{rad} / \mathrm{m})...
(a) Frequency is calculated as $v=\omega / 2 \pi=5.4 \times 10^{6} /(2 \times 3.14)=0.859 \times 10^{6} \mathrm{~Hz}$ (b) Amplitude of the magnetic field can be calculated...
?(a) The motion is going in the opposite direction of the y-axis. To put it another way, along -j. (b) The given equation is compared with the equation and we get, $E=E_{0} \cos (k y+\omega t)$...
and amplitude 
. Show that the average energy density of the 
field equals the average energy density of the B field. ![\left[\mathrm{c}=3 \times 10^{8} \mathrm{~m} \mathrm{~s}^{-1}\right]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-96ac54c20f4c7b80bd9bf00b657be717_l3.png "Rendered by QuickLaTeX.com")
Frequency of the electromagnetic wave is given as $\mathrm{v}=2 \times 10^{10} \mathrm{~Hz}$ Electric field amplitude is given as $E_{0}=48 \vee \mathrm{m}^{-1}$ Speed of light is known as $c=3...
and amplitude .Frequency of the electromagnetic wave is given as $\mathrm{v}=2 \times 10^{10} \mathrm{~Hz}$ Electric field amplitude is given as $E_{0}=48 \vee \mathrm{m}^{-1}$ Speed of light is known as $c=3...
Chemical equation for the recovery of silver from silver nitrate solution which involves displacement by copper metal is as follows:- 2AgNO3 (aq) + Cu (s) → Cu(NO3)2 (aq) + 2Ag (s)
(for the energy of a quantum of radiation: photon) and obtain the photon energy in units of eV for different parts of the electromagnetic spectrum. In what way are the different scales of photon energies that you obtain related to the sources of electromagnetic radiation?The energy of a photon is represented by the expression, $\mathrm{E}=\mathrm{hv}=\frac{h c}{\lambda}$ Where, $\mathrm{h}$ is the planck's constant with a value of$6.6 \times 10^{-34} J_{S}$...
(a) When heat is applied, a decomposition reaction occurs. 2Pb(NO3)2→ 2PbO + 4NO2 + O2 (b) Decomposition reaction in the presence of light 2AgCl → 2Ag + Cl2 (c) Decomposition reaction with the...
and that its frequency is 
.(a) Determine 
and (b) Find expressions for 
and 
.Electric field amplitude is given as $E_{0}=120 \mathrm{~N} / C$ Frequency of source is given as $v=50 \mathrm{MHz}=50 \times 10^{6} \mathrm{~Hz}$ Speed of light is known as $c=3 \times 10^{8}...
Antioxidants are utilized as preservatives in fat-containing foods to delay oxidation-induced rancidity. Antioxidants with longer half-lives, such as butylated hydroxytoluene (BHT) and butylated...
. What is the amplitude of the electric field part of the wave?Amplitude of magnetic field of an electromagnetic wave in a vacuumis given to us as, $B_{0}=510 n T=510 \times 10^{-9} T$ Speed of light in vacuum is known as $\mathrm{c}=3 \times 10^{8} \mathrm{~m}...
A decomposition reaction is used to extract several metals from their naturally occurring compounds such as oxide and chloride. Example: 2NaCl → 2Na + Cl2
. What is the frequency of the electromagnetic waves produced by the oscillator?The frequency of an electromagnetic wave generated by the oscillator is the same as that of a charged particle oscillating around its mean position, which is $10^{9} \mathrm{~Hz}$.
(a) Electricity decomposes into hydrogen and oxygen gas when it passes through acidified water. 2H2 O → 2H2 + O2 (a) Thermal decomposition occurs when heat is applied. An example of thermal...
to 
bands. What is the corresponding wavelength band?The minimum frequency for a radio to tune is given as $v_{1}=7.5 M H z=7.5 \times 10^{6} H z$ $=\frac{3 \times 10^{3}}{7.5 \times 10^{8}}=40 \mathrm{~m}$ $\lambda_{2}=\frac{c}{v_{2}}$ $=\frac{3...
In a vacuum, the electromagnetic wave travels in the z-direction. In the $x-y$ plane, there is an electric field (E) and a magnetic field $(\mathrm{H})$. They are perpendicular to one other....
Nitrogen is used to flush the packet of chips or foods containing fats and oils. This is because nitrogen acts as an antioxidant. The food is packaged to keep it from getting oxidizing. When we pack...
-rays of wavelength 
, the red light of wavelength 
and radiowaves of wavelength 
All wavelengths of light travel at the same speed in a vacuum. In the vacuum, it is unaffected by the wavelength.