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In the process of extraction of gold , ...

In the process of extraction of gold , Roasted gold ore ` + CN_((aq))^(-) + H_(2)O overset(O_(2))to [X] + [OH^(-)]`
` [X] + Zn to [Y] + Au`
Indentify the complexes [X] and [Y]

A

the temperature is lowered

B

the volume of the system is decreased

C

`N_(2)` is added at constant volume

D

`NH_(3)` is added

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The correct Answer is:
4
From Le- chatelir principle
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