Question

The correct statement is:
A. Zincite is a carbonate ore
B. Aniline is a froth stabilizer
C. Zone refining process is used for the refining of titanium
D. Sodium cyanide cannot be used in the metallurgy of silver

Answer 1

Hint:Ores are the impure forms of the metals. In nature metals are not exited in pure form, they exist in different forms by combining with other chemicals. The reason behind this is pure metals are not stable in nature. They have to be purified by using different techniques.

Complete answer:
- We have to find the correct statement among the given options.
- Coming to option A, Zincite is a carbonate ore. The molecular formula of zincite is ZnO. Means zincite contains oxides of zinc as the ore. Then option A is wrong.
- Coming to option C, Zone refining process is used for the refining of titanium. It is also wrong because the zone refining process is used to refine silicon and germanium.
 - Coming to option D, Sodium cyanide cannot be used in the metallurgy of silver. It is also wrong because without sodium cyanide we cannot extract silver from its ore in metallurgy.
- Coming to option B, Aniline is a froth stabilizer. Yes it is correct. Cresols and aniline acts as froth stabilizers during metal extraction from the respective ores.

So, the correct statement among the given options is B.

Note:
The principle behind the froth flotation process is sulphide ores are specially wetted by using pine oil, while the gangue particles are wetted by using water. In the froth flotation process a suspension of the ore is made with water. Collectors like xanthates, pine oil and fatty acids are added to the suspension. Aniline and cresols are the froth stabilizers added to make the stabilization of the froth created during the process.