Select the correct statements:

Moderate

A

In hydrometallurgy, Zn is used as oxidising agent in the purification of Ag from ${[Ag (CN)_{2}]}^{â}$ .
B

When pine oil or eucalyptus oil is added into the water, it lowers down the surface tension by which froth is formed
C

Sodium ethyl xanthate is used as collector
D

Basic copper carbonate or PbSO₄ is concentrated by froth flotation method by using an activator

Solution

Hydrometallurgy is a chemical metallurgy method that conducts separation and extraction of metals based on reaction in aqueous medium.

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