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A charged rod P attracts a rod R whereas P repels another charged rod Q. What type of force is developed between 
Ans: Suppose that the rod $\mathrm{P}$ is negatively charged. As it attracts rod $\mathrm{R}$, it can be said that $\mathrm{R}$ is positively charged. Also, since $P$ repels rod $Q$, it can be said...
Does the force between two point charges change if the dielectric constant of the medium in which they are kept is increased?
Ans: Dielectric constant of a medium is given by $$ \begin{array}{l} k=\frac{F_{y}}{F_{M}}=\frac{\text { force between the charges in vaccum }}{\text { force between two charges in medium }} \\...
State the role of silica in the metallurgy of copper
Solution 8: The following processes are involved in the extraction of zinc from zinc blende: (i) Concentration: Zinc blende ore is crushed and the concentration done by froth- floatation process....
State the role of silica in the metallurgy of copper.
$$ \begin{array}{l} \hline \mathrm{FeO}+\mathrm{C} \longrightarrow \mathrm{Fe}+\mathrm{CO} \\ \mathrm{CaCO}_{3} \stackrel{\Delta}{\longrightarrow} \mathrm{CaO}+\mathrm{CO}_{2} \\...
Write chemical reactions taking place in the extraction of zinc from zinc blende.
Solution 8: The following processes are involved in the extraction of zinc from zinc blende: (i) Concentration: Zinc blende ore is crushed and the concentration done by froth- floatation process....
Write down the reactions taking place in different zones in the blast furnace during the extraction of iron.
Solution 7: In the blast furnace reduction of iron oxides take place at different temperature ranges as shown below. At $500-800 \mathrm{~K}$ $$ \begin{array}{l} 3 \mathrm{Fe}_{2}...
Name the common elements present in the anode mud in electrolytic refining of copper. Why are they so present?
Solution The common elements present in the anode mud are antimony, selenium, tellurium, silver, gold and platinum. These elements settle down under anode as anode mud because they are less reactive...
Out of 
Solution 5: This can be explained thermodynamically, taking entropy and free energy changes into account (a) $C(s)+O_{2}(g) \rightarrow C O_{2}(g)$ (b) $2...
Explain:
(i) Zone refining
(ii) Column chromatography
Solution 4: (i) Zone refining: This method is used for production of semiconductors and other metals of very high purity, e.g., $\mathrm{Ge}, \mathrm{Si}, \mathrm{B}, \mathrm{Ca}$ and $\mathrm{In}$....
Explain:
(i) Zone refining
(ii) Column chromatography
Solution 4: (i) Zone refining: This method is used for production of semiconductors and other metals of very high purity, e.g., $\mathrm{Ge}, \mathrm{Si}, \mathrm{B}, \mathrm{Ca}$ and $\mathrm{In}$....
Why is the extraction of copper from pyrites more difficult than that from its oxide ore through reduction?
Solution 3: $\Delta_{f} G^{o}$ of $\mathrm{Cu}_{2} \mathrm{~S}$ is more negative than $\Delta_{f} G^{\circ}$ of $\mathrm{CS}_{2} \mathrm{H}_{2} S$. So $C_{u} 2 S$ can not be reduced by carbon or...
What is the role of depressant in froth-floatation process?
Solution 2: The role of depressant is to prevent one type of sulphide ore particles from forming the froth with air bubbles. $\mathrm{NaCN}$ is used as a depressant to separate lead sulphide (PbS)...