Select the correct statements:

Options

A. In hydrometallurgy, Zn is used as oxidising agent in the purification of Ag from `[Ag(CN)_2]^(ѳ)`
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 ethylxanthate is used as collector
D. Basic copper carbonate or `PbSO_4` is concentrated by froth floatation method by using an activator

Explanation

B, C, D