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The cyanide process of gold extraction i...

The cyanide process of gold extraction involves leaching out gold from its ore with `CN^(-)` in the presence of Q in water to form R . Subsequently , R is treated with T to obtain Au and Z. Choose the correct option (s)

A

R is `[Au(CN)_4]^(-)`

B

T is Zn

C

Q is `O_2`

D

Z is `[Zn(CN)_4]^(2-)`

Text Solution

Verified by Experts

The correct Answer is:
B, C, D
`4Au + 8CN^(-) + O_2 + 2H_2 O to 4 [Au(CN)_2]^(-) + 4OH^(-)`
(ii) `2[Au(CN)_2]^(2-) + underset((T))(Zn) to underset((Z))([Zn(CN)_4]^(2-) + 2Au`
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Statement-1:In cyanide process for the extraction of gold and silver from their natives, ores, the cuanide solution acts as a reducing agent to reduce the gold and siver compound present in the ores into the metallic states. Statement-2:In the extraction of gold and silver, the cyanide solution acts as complexing ragent in the presence of air and form their respective soluble complexes.