Answer: (e) If a coil is viewed from one end, and the current flows in a clockwise direction, then this end is a south pole. Explanation: The clock face rule determines the coil's polarity. If we...
Answer: (c) The magnetic effect of a coil can be increased by increasing the number of turns increasing the current or inserting an iron core. Explanation: The strength of an electromagnet can be...
Answer: a) The lines of magnetic field round a straight current-carrying conductor are in the shape of concentric circles. Explanation: b) For a current-carrying solenoid, the magnetic field is like...
Answer: Listed below are the three methods by which the strength of an electromagnet can be increased: a) Increasing the number of turns in the coil is one way to accomplish this. The current...
Answer: A solenoid is the shape of a current-carrying conductor with a magnetic field pattern that is similar to that of a bar magnet.
Answer: True A lengthy circular coil carrying current has a field of parallel straight lines. The figure depicts a similar circumstance. In this case, the right-hand rule is applicable. Imagine a...
Answer: Maxwell's right-hand thumb rule is also known as the corkscrew rule. According to the rule, fingers curl in the direction of magnetic field lines when the thumb of the right-hand points in...
Answer: Concentric circles are formed by the magnetic lines that surround a straight current-carrying conductor.
Answer: Maxwell's right-hand thumb rule is used to determine the direction of a magnetic field created by a straight current-carrying conductor.
Answer: In the case of a current-carrying solenoid, the magnetic field becomes extremely powerful when an iron core is introduced.
Answer: Oersted was the physicist who made the discovery of the magnetic effect of electrical current.
Answer: The observation of a current-carrying wire deflecting a compass needle leads to the conclusion that a magnetic field is produced around the needle.
Answer: A current-carrying wire disguised in a wall can be detected using the magnetic effect of current.
Answer: a) When the north magnetic pole moves, the magnetic field lines move. Magnetic field lines are also called magnetic force lines. Activity: Compass and bar magnet, please. Attach the bar...
Answer: In the presence of an electric current flowing through a wire, it is true that a magnetic field is A magnetic field is created when an electric current flows across a wire. But these...
Answer: Because the resultant force on the north pole is always in one direction, the two magnetic field lines do not cross. The resultant force will be in two directions when the magnetic field...
Answer: When a magnet is present, the magnetic field is defined as the space surrounding the magnet in which the magnetic force is exerted. Using a compass needle, it is possible to detect the...
Answer: The diagram to show magnetic line around the bar magnet is:
Answer: a) North and south b) Bar and south Explanation: A magnetic compass can trace a bar magnet's magnetic field lines. The compass can be moved from one bar magnet pole to another. In order to...
Answer: It is necessary to install magnetic strips in the refrigerator doors in order to keep the door closed.
Answer: Because the needle is exposed to the magnetic field exerted by the bar magnet, when a compass needle is brought close to the bar magnet, it deviates off its course.
Answer: False The axis of the imaginary magnet of the earth and the axis of the geographical axis are 15 degrees out of phase with each other.
Answer: When the magnetic field lines are the nearest to each other, the magnetic field is at its strongest level.
Answer: The magnetic field pattern of a bar magnet can be determined in two ways: first, by measuring the voltage across the magnet; and second, by measuring the current through the magnet.
Answer: Listed below are some characteristics of magnetic field lines: a) Always begin at the north pole and end at the south pole, magnetic field lines are created. b) The magnetic field lines...
a) Long sightedness is a vision problem in which a person can't see items that are far away yet can see objects that are close by. The two main reasons of long-sightedness are as follows: I The eye...
a) Short sightedness is a vision problem in which a person has trouble seeing items that are maintained close by. The two main causes of nearsightedness are as follows: I An excessive curvature of...
Long, concave, short, convex, and retina are some of the shapes available.
When a person's eye develops a gradual hazy development that causes impaired vision, he is said to have acquired cataract. Surgery is used to address this flaw. In addition, an opaque lens is...
Presbyopia is a visual problem in which a person's ability to perceive adjacent things is hampered owing to a lack of eye accommodation power. This is due to the ciliary muscles being weaker and the...
a) For long-range vision, P = -5.5D 1/f = P f = 1/P = -18.18cm b) For close-up vision, 1.5D = P 1/f = P f = 1/P = 66.66cm
If you have hypermetropia, you should wear convex lenses. Given, u = -25cm object distance v = -50cm image distance 1/v-1/u=1/f 100/f = 100/50 = 2D
Myopia sufferers can benefit from concave lenses. Given, 2m is the far point of a myopic eye. u = infinite, object distance v = 2m image distance 1/v-1/u=1/f f = -2m f = -2m f = -2m -0.5D = P = 1/f...
Hypermetropia, often known as long-sightedness, is a condition in which a person is unable to see clearly adjacent things. A convex lens can be used to remedy the problem. The ray diagram is as...
Myopia, often known as short-sightedness, is a condition in which a person has trouble seeing objects that are close by. A concave lens is used to remedy this flaw. The ray diagram for myopia...
Myopia is corrected using a diverging lens. The ray diagram for myopia correction is as follows: a) For a myopic eye, image production occurs in the front of the retina. b) F is the myopic eye's far...
Hypermetropia is corrected using a convergent lens. a) If a person has hypermetropia, the image of a close object will develop behind the retina. b) N' is the hypermetropic eye's near point, which...
Myopia is a condition in which a person can see items close up but has trouble seeing objects at a distance. Hypermetropia is a condition in which a person can see items that are situated at a...
Myopia and hypermetropia are the two most frequent visual problems that may be treated by concave and convex lenses, respectively.
a) Distant, concave b) Nearby, convex
a) Myopia b) Concave lens
a) Hypermetropia b) Convex lens
a) Short-sighted b) Diverging lenses
The near point for a person with hypermetropia is 25 centimetres.
Less than infinity is the furthest point for a myopic person
Eye
Cataract
a) Myopia b) Hypermetropia
Presbyopia
Cataract is the visual impairment that causes the eye lens to become hazy, resulting in blurred vision.
Presbyopia is the visual problem caused by the eye lens losing its accommodation power as it ages.
A concave lens can be used to correct short-sightedness.
a) Concave lens b) Convex lens
a) Myopia b) Hypermetropia
a) Near-sightedness b) Far-sightedness
a)convex lens are kind of corrective lens used. b)concave lens are kind of corrective lens used
a) Through the use of a concave lens-Myopia b) Through the use of a convex lens-Hypermetropia
a) Whose nearest point is further away than 25cm is Hypermetropia b) Whose far point is smaller than the limit of infinity Myopia
Myopia is one of the visual impairments that may be corrected using a concave lens.
d) iris is the correct answer.
The correct response is a) the pupil enlarges.
The correct response is c) the lens thickens or thins.
The correct response is c) concentrate on things at various distances.
c) iris is the correct answer.
The correct answer is c) change the lens' focal length.
The correct response is d) the eye-lens thickness is raised.
The proper response is c), which includes both the cornea and the lens.
b) 25cm is the right answer.
Ciliary muscles is the right answer.
d) retina is the right answer.
a) Cornea: The cornea is the front portion of an eye through which light enters. b) Iris: The iris regulates the quantity of light that enters the eye. c) Pupil: The pupil controls the amount of...
b)working of human eye c)The iris changes the size of the pupil in response to changing light intensity. The iris contracts the pupil and decreases the quantity of light entering the eye when the...
a) (i) In dim light, the pupil dilates. ii) In strong light, the pupil shrinks.' b) i) Cones ii) Rods iii) Cones
a) The convex eye lens differs from a regular convex lens in that the ciliary images regulate the focal length of the convex lens in the eye, but the focal length of a regular convex lens is set by...
The cells in the retina of an eye are called rods and cones. Rods are cells that have a rod form and are sensitive to low light. Cones are light-sensitive cones that are cone-shaped. Humans have a...
a) The retina has two types of light-sensitive cells. b) Rods and cones are the names for these cells. c) Rods respond to dim light, whereas cones respond to strong light.
The ciliary muscles are used to concentrate on objects that are far away. The suspensory ligaments are drawn and connected to the eye lens, and the ciliary muscles are totally relaxed.
When the ciliary muscle relaxes, the eye lens becomes thinner, making it easier to perceive distant things. When the ciliary muscle contracts, the eye lens thickens, making it easier to view close...
a) The pupil reduces in size. b) There is a reduction in the quantity of light that enters the eye.
When you enter a dim room from bright sunlight outside, it takes some time to see items since the pupil size is tiny and the intensity of light outside is higher. The pupil widens as we enter a...
When we walk into a darkened cinema theatre after being in strong sunlight, we can't see much well at first. However, our vision improves quickly. Because the amount of light entering the eye...
The quantity of light that enters the eye is controlled by the iris. The size of the pupil is changed depending on the strength of the light received by the eye. If the intensity of the light...
The ciliary muscles of the eye must either be totally relaxed or stretched in order for an eye to concentrate on things at varying distances. The ciliary muscle contracts, causing the suspensory...
a) When the eye is focused on a distant object, the focal length of the eye-lens is at its maximum. b) When the eye is focused on a close object, the converging power of the eye-lens is at its...
a) The eye-lens thickens when the eye is focused on a close object. b) The eye-lens grows narrower when the eye is focused on a distant object.
Because the eye's accommodation power of 25cm is spent, a typical eye cannot see clearly things that are put closer than 25cm. When the eye's maximal accommodation is achieved, the ciliary muscles...
a) The outer surface of the eye is where the majority of light rays entering the eye are refracted is cornea, b) The light-sensitive portion of the eye is retina, c) The portion of the eye that...
a) The optic nerve b) Muscles of the iliac crest c) Student d)Cornea e) Contact lenses
The capacity of an eye to concentrate a distant as well as a local object on the retina by altering the focal length of the lens is known as power of accommodation.
Ciliary muscles allow us to focus on both close and far things in rapid succession.
A typical human eye has a visual range of infinity to 25cm.
a) The furthest point of a typical human eye is infinity. b) The near point of a typical human eye is 25 cm.
For a typical human eye, the minimum distance of clear vision is 25cm.
Fossil fuels are non-renewable sources of energy, i.e. they are not available in large quantities and cannot be replenished. So we need to find alternate sources of energy. If not controlled, fossil...
Disadvantages of fossil fuels are as follows: Air pollution is caused by fossil fuels such as coal and petroleum because large amounts of pollutants are released.When a fossil fuel is burned, gases...
Natural gas can be utilized for heating and cooking for the following reasons: Easy to use 2. Easily available 3. Easily transportable 4. Does not produce a lot of smoke on burning. 5. HIghly...
When a fuel is readily available and gives a substantial amount of heat energy when burnt, it is said to be a good fuel.
Following are the properties of a good source of energy: It's economical 2. It's easy to store and transport 3. It's easily available 4. It's work done per unit volume or mass should be...
Solution: Option (c) is the answer.
Solution: Option (b) is the answer.
The ozone layer serves as a shield for the earth. It keeps dangerous UV rays out of the atmosphere, which are hazardous and can cause skin cancer. However, air pollutants such as chlorofluorocarbons...
Microorganisms breakdown biodegradable wastes into simpler molecules that can be used as a raw material by companies. However, the following are the consequences of a surplus of biodegradable waste:...
The following are some of the issues that non-biodegradable wastes cause: Microorganisms are unable to breakdown these compounds.Dumping becomes a challenge as the quantity grows.In the top trophic...
Biological amplification is the gradual increase in the concentration of the non-biodegradable contaminants in the food chain. All subsequent levels are affected as ecological amplification occurs...
Yes, the effects of removing all species from a trophic level will vary depending on the trophic level. If all the producers are gone, there is a potential that the principal consumers would die or...
If all of the species in one trophic level are killed, the food supply to the next level will be cut off, causing an ecosystem imbalance. As a result, the animals at higher trophic levels will die,...
All of the above
b. Grass, goat and human The grass is the primary producer, the goat is the primary consumer, and the human is the secondary consumer in this scenario.
a) Grass, flowers and leatherc) Fruit peels, cake and lime juiced) Cake, wood and grass The groupings that contain exclusively biodegradable things are the most important. That group cannot be...
The following are some suggestions for reducing the trash disposal issue: 3 R's: The 3 R's can help to alleviate the problem of waste disposal. Reduce, recycle, and reuse are the three R's. Air...
Ozone is a molecule made up of three oxygen atoms that is classified as an isotope of oxygen. The major function of the ozone layer is to protect the earth's surface from the sun's harmful UV rays....
Solution: Option (c) is the answer.
Solution: Option (d) is the answer.
Solution: Option (a) is the answer.
The following are some of the ways that non-biodegradable compounds might harm the environment: They cause soil, air and water pollution.They have the potential to produce bio-magnification in the...
Solution: Option (c) is the answer. Because a thin oxide layer forms on the surface of aluminium, it resists corrosion (aluminium oxide or Al2O3). This inhibits additional corrosion by forming a...
Solution: Option (d) is the answer. Mercury and copper are both low on the reactivity range and are less reactive metals. As a result, they can be removed by heating their sulphides in air and then...
Biodegradable compounds would have the following effects on the environment: They help to keep the environment clean since they degrade quickly. 2. With the help of decomposers, they can easily...
Solution: Option (c) is the answer. Bauxite is a reddish clay-based rock that is most often found in tropical and subtropical climates. Aluminum oxide compounds (alumina), silica, iron oxides, and...
Solution: Option (c) is the answer. Hematite, sometimes spelt haematite, is a common iron oxide compound with the formula Fe₂O₃ that may be found in a variety of rocks and soils. Hematite crystals...
Because microbes like bacteria and decomposers like saprophytes have a specific role to play, some compounds are biodegradable while others are not. They can only break down natural materials like...
Solution: (d) An alloy is a combination of two or more metals that is homogenous (or a metal and small amounts of non-metals). Alloys include metals such as steel and brass. (e) Alloys are tougher...
The roles of a decomposer in the ecosystem are: By decomposing the dead plants and animals, they operate as a cleaning agent for the environment.They help in recycling the nutrientsBy decomposing...
Solution: Option (d) is the answer. Pyrolusite is a mineral consisting essentially of manganese dioxide (MnO2) and is important as an ore of manganese. It is a black, amorphous appearing mineral,...
The transfer of food or energy occurs at several levels in the food chain, and these levels are referred to as trophic levels. Example: Grass → Goat → Man In the food chain, The first trophic level...
Individuals can adopt the following adjustments into their habits to progress toward a more sustainable use of natural resources: Divide household garbage into biodegradable and non-biodegradable...
Practices for the conservation of natural resources include: When travelling, use bicycles and public transportation to save money on gas.Recycled paper and other recycled goods are used.Garbage is...
Individuals can limit their usage of natural resources by implementing the following practises: Carpooling, bicycling, and public transportation are all fuel-efficient modes of...
An individual can contribute towards the management of non-renewable energy sources such as coal and petrol by: Using fuel-efficient modes of transportation such as carpooling, public...
(a) Individuals can help manage forest and wildlife resources by doing the following: Organizing and participating in anti-deforestation and anti-wildlife poaching rallies.Volunteering for a variety...
Because they are a branch of the government that is elected by the people, the government's forest department should have the authority. These forest officials, on the other hand, must not be...
Some important changes that can help make schools more environment-friendly include: Providing a platform for kids and teachers to report any leaky faucets so that the school plumber can swiftly fix...
Some important changes that can help make homes more environment-friendly include: Garbage is separated into biodegradable (food waste) and non-biodegradable (non-biodegradable) waste...
Groundwater is the principal source of water in metropolitan areas. All residents of the city have access to this water. However, in other areas, insufficient infrastructure makes it impossible for...
Rainwater is frequently collected and channelled through a stream in hilly areas. With the use of canals, the stream is channelled to different locations for irrigation. Water is typically obtained...
Groundwater and lakes are the principal sources of water in densely populated metropolitan areas. Borewells are used to extract groundwater, whereas pipes extract water directly from lakes. The...
Forest conservation can be accomplished in a variety of ways, including: To counteract deforestation, trees are being planted.Security troops are stationed in forests to deter forest resource...
Forest conservation is critical to the environment's long-term stability. Forests are home to a diverse range of living forms. Destruction of these forests has the potential to disrupt the food...
Equitable resource distribution ensures that everyone gets their fair share of the resources and that everyone has the fundamental necessities of life (such as food, water, shelter, etc.). The...
Solution: (a) Zinc (b) Cinnabar Mercury (II) sulphide, HgS (c) The concentrated copper (I) sulphide ore (copper glance), Cu2S is roasted in the air to oxidize copper (I) sulphide to copper (I)...
The long-term model of resource consumption allows for resource conservation so that future generations can benefit from them. This will allow the economy to expand over a longer period of time. It...
Solution: (c) Mercury (II) sulphide ore is roasted in the air to give mercury (II) oxide. 2HgO → 2Hg(l) + O2(g) (d) Anode – Thick block of impure metal M. Cathode – Thin strip of pure metal M....
Solution: (a) Sodium. (b) (i) Calamine; Zinc carbonate, ZnCO3 (ii) Zinc blende; Zinc sulphide, ZnS
Solution: (c) When zinc sulphide (zinc blende ore) is roasted in the air, zinc oxide and sulphur dioxide are formed. Roasting is the term for this procedure. 2Zn(s) + 3O2(g) → 2ZnO(s) + 2SO2 Zinc...
Solution: (a) Aluminium. (b) Haematite; Iron (III) oxide, Fe2O3.
Solution: (c) Aluminium metal is recovered from molten aluminium oxide by electrolytic reduction (electrolysis). When molten aluminium oxide is exposed to an electric current, it decomposes into...
Solution: (a) Haematite ore is used to extract iron. (b) Bauxite; Al2O3.2H2O; Aluminium oxide
Solution: (d) Electrolytic reduction of molten sodium chloride extracts sodium metal. When molten sodium chloride is exposed to an electric charge, it decomposes into sodium metal and chlorine gas....
Solution: (a) Minerals are naturally occurring metals or their compounds, whereas ores are minerals that contain a large amount of metals that may be extracted successfully. (b) Mercury. c) Sodium...
Solution: (a) Gold and platinum are mostly found in the free state in nature. (b) Sodium and Magnesium are almost always found together. (c) Iron (III) oxide; haematite ore contains...
Solution: (c) When calamine ore is calcined, carbon dioxide is produced. (d) When cinnabar ore is roasted, sulphur dioxide gas is produced.
Solution: (a) To get aluminium metal, aluminum oxide is electrolyzed in a molten condition. During the process, oxygen gas is produced. (b) To produce sodium metal, sodium chloride is electrolyzed...
Solution: A broad block of impure metal is used as an anode (attached to the battery's +ve connector) and a thin strip of pure metal is used as a cathode when electrolysis is used to refine an...
Solution: (a) In addition to carbon, aluminium can be employed as a reducing agent. (b) When sodium chloride is electrolyzed in an aqueous solution, sodium metal is produced at the cathode and...
Solution: (a) Zinc carbonate decomposes into zinc oxide and carbon dioxide when heated rapidly in the absence of air. ZnCO3(s) → ZnO(s) + CO2 (b) Copper metal and sulphur dioxide are formed when...
Solution: (a) When the paint is put to a surface, it keeps the object from rusting by preventing air and moisture from coming into touch with it. (b) Copper alloys such as brass and bronze have...
Solution: (a) Brass: It is made up of 80 per cent copper (Cu) and 20 per cent zinc (Zn). It's used to make kitchen utensils. (b) Copper reacts slowly with carbon dioxide and water to form a basic...
Solution: (a) Aluminium and zinc are corrosion-resistant metals. (b) (i) Painting. (ii) Grease or oil application. (iii) Galvanization. (iv) Plating with tin and chromium. (v) Stainless steel is...
Solution: (a) An alloy is a homogeneous mixture of metals that is made by melting the individual metals and cooling them to room temperature. (b) Steel is made up of carbon and iron. In comparison...
Solution: Rust is a red-brown flaky material that forms when an iron object is exposed to wet air (or water) for an extended period of time. This is referred to as iron rusting. We insert some...
Solution: (c) Rusting (d) When aluminium comes into proximity with wet air, it corrodes fast. It creates an oxide layer on top of the metal. It protects against rusting. Utensils are made out of...
Solution: (a) Corrosion is the result of a metal's surface being exposed to air, moisture, or a chemical. c) Platinum and gold.
Solution: A burning magnesium ribbon ignites a mixture of Iron (III) oxide and aluminium powder. With the help of a lot of heat, aluminium reduces iron oxide to produce iron metal. Iron metal is...
Solutions: (b) It is important to eliminate the gangue before extracting metal from its ore, and after that, we will get a concentrated ore. This is known as ore concentration, sometimes known as...
Solution: Solutions: (a) (i) Minerals are made up of metals or compounds found on the surface of the earth. (ii) Ores are minerals that may be used to extract metals in a practical and profitable...
Solution: Metal refining is the process of purifying impure metals. The most common technique for purifying impure metals acquired via various reduction processes is electrolytic refining. The...
Solution: Heat alone is used to recover the less reactive metals by reducing their oxides. When mercury (II) oxide is produced, for example, mercury (II) sulphide ore is roasted in the air. Mercury...
Solution: The oxides of moderately reactive metals are reduced with carbon, aluminum sodium, or calcium to extract them. Example: When zinc sulphate is heated to high temperatures in the air, zinc...
Solution: Electrolytic reduction of their molten chlorides or oxides extracts the highly reactive metals. The electrolytic reduction of molten sodium chloride, for example, extracts sodium metal....
Solution: The method of extracting metal from a concentrated ore is simply a reduction of the metal complex present. Manganese metal is made by reducing manganese oxide with aluminium powder rather...
(b) Name one ore of manganese. Which compound of manganese is present in this ore? Also, write its chemical formula. (c) A zinc ore on heating in air forms sulphur dioxide. Describe briefly any two...
Solution: (c) Calamine ore decomposes into zinc oxide and carbon dioxide when heated rapidly in the absence of air. ZnCO3 → ZnO + CO2 The zinc oxide is then heated with carbon to generate zinc...
(b) Give the name and chemical formula of one ore of copper. Solution: (a) Electrolytic reduction is the method used to extract the aluminium metal. Electrolysis is used to obtain aluminium. The...
(b) Explain why, though aluminium is more reactive than iron, yet there is less corrosion of aluminium when both are exposed to air. Solution: (a)To keep the iron grill from rusting, it is painted...
(b) What is meant by ‘anodising’? Why is it done? Solution: (a)Aluminum is more reactive than iron, and when it comes into contact with air, it creates an oxide layer, which is why it does not rust....
(b) Explain why the surface of some metals acquires a dull appearance when exposed to air for a long time. Solution: (a) Copper is used in the construction of hot water tanks because it does not...
Column IColumn IIAluminiumElectrolytic reductionZincReduction with carbonSodiumReduction with aluminiumIronManganeseTin Solution: Electrolytic reduction: Aluminium and Sodium; Reduction with carbon:...
Solution: A thermite reaction is the reduction of a metal oxide to metal utilizing aluminium powder as a reducing agent. A burning magnesium ribbon ignites a mixture of Iron (III) oxide and...
Solution: Manganese metal is extricated by the reduction of its oxide with aluminium powder as the reducing agent. In this manner, when manganese dioxide is warmed with aluminium powder, then, at...
(a) NH4NO3 (b) NH4Cl (c) CaCl2 (d) KCl Answer: Option (d) is the answer.
If the pH of the solution is less than 7, the salt is most likely to be: (a) CH3COONa (b) Na2CO3 (c) KCl (d) NH4Cl Answer: Option (d) is the answer.
(a) K2CO3 (b) K2SO4 (c) NaCl (d) NH4Cl Answer: Option (a) is the answer.
(a) CaSO3.2H2O (b) CaCl2.2H2O (c) CaCO3.2H2O (d) CaSO4.2H2O Answer: Option (d) is the answer.
(a) CaSO4 (b) Ca(OH)2 (c) Mg(OH)2 (d) KOH Answer: Option (b) is the answer.
(a) K2CO3 (b) KHCO3 (c) NaHCO3 (d) KNO3 Answer: Option (c) is the answer.
(a) KCl (b) K2SO4 (c) K2CO3 (d) KNO3 Answer: Option (c) is the answer.
(i) The alloy in which one of the metals is mercury is called an _______. (j) The electrical conductivity and melting point of an alloy is _______ than that of pure metals. (k) The rocky material...
(g) Bronze is an alloy of copper and _______. (h) The non-metal present in steel is _______. Solution: (g) tin (h) carbon
(a) Potassium sulphate (b) Sodium carbonate (c) Ammonium sulphate (d) Sodium acetate Answer: Option (a) is the answer.
(a) Potassium sulphate (b) Sodium sulphate (c) Sodium chloride (d) Potassium carbonate Answer: Option (d) is the answer.
(e) The corrosion of copper produces a _______ coating of basic copper carbonate on its surface. (f) Brass is an alloy of copper and _______. Solution: (e) green (f) zinc
(c) The process of depositing a thin layer of zinc on iron articles is called _______. (d) Tiffin boxes are electroplated with _______ but car bumpers are electroplated with _______ to protect them...
(a) Ammonium sulphate (b) Sodium acetate (c) Sodium chloride (d) Potassium carbonate Answer: Option (a) is the answer.
(a) Five (b) Two (c) Ten (d) Seven Answer: Option (c) is the answer.
(a) NaCl, Cl2 , and H2 (b) Cl2 , H2 and NaOH (c) Cl2, Na2CO3 and H2O (d) NaOH, Cl2 and HCl Answer: Option (b) is the answer.
(a) The corrosion of iron is called _______. (b) _______ and _______ are necessary for the rusting of iron. Solution: (a) rusting (b) air; water
(a) CH3COONa (b) NH4Cl (c) KCl (d) Na2CO3 Answer: Option (c) is the answer.
(a) Na2CO3 (b) Na2SO4 (c) NaCl (d)(NH4)2SO4 Answer: Option (a) is the answer.
(a) KCl (b) NH4Cl (c) Na2CO3 (d) CH3COONa Answer: Option (b) is the answer.
(a) What is meant by ‘hydrated’ and ‘anhydrous’ salts? Explain with examples. (b) Write the names, formulae, and colours of any two hydrated salts. (c) What will be the colour of litmus in an...