Question

Mark the correct answer
(i) Mercury can be refined by process of distillation
(ii) In poling, the molten impure metal is stirred with green poles of wood
(iii) In electrolytic refining of metals, impure metal is made as a cathode and a thin strip of metal is anode.
(A) i and ii
(B) i and iii
(C) ii and iii

Answer 1

To answer this question we should be aware of the refining methods used to extract metal such as refining process by distillation, poling and electrolytic refining. Understanding the conditions of these methods may help us remember these methods forever.

Complete Solution :
Let's look into each points in order to analyze and understand better
(i) Mercury can be refined by the process of distillation.
Distillation is the process of separating any substance or metals that is dissolved in liquid by heating and condensing. The distillation process to refine the metal from its ore is done to only the metals with low boiling points like mercury and zinc.so, the above made statement is correct.

(ii) In poling, the molten impure metal is stirred with green poles of wood
A process that is used in refining metal. This method is used when the metallic oxide is present as impurities of the metal that is to be extracted. In the furnace the green poles of wood are used to stir. The green pole is used because while heating this won't get burnt but if we use a dry pole it will get burnt very easily. Thus this statement is correct.

(iii) In electrolytic refining of metals, impure metal is made as a cathode and a thin strip of metal is anode.
- To exactly know whether this point is correct or wrong. Firstly let's know about the process of electrolytic refining.
- It is the process to refine metal ore in which impure metals are made of anode and thin strip of metals which is made as anode. The metal salt of solution is the electrolyte. When electric current is passed over the impure metals from anode get dissolved and an equal amount of pure metals gets deposited on anode from electrolyte. The impurities get settled in the bottom of the beaker. From the above discussion we can figure out this statement is wrong as this statement is exactly contradictory to the reality.
So, the correct answer is “Option A”.

Note: It is evident that it is very important to remember the condition under which each of above mentioned methods are performed.
(i) The distillation process is feasible to extract the metals with low boiling point.
(ii) Separating copper from the impurities. The impurity here is copper oxide. It is an old method by which this low grade of copper is yielded.
(iii) The impure metal is anode and the pure metal is used as cathode.