First slide

General methods of extraction of elements from the earth crust

Question

In the leaching of Ag₂S with NaCN, a stream of air is also passed. It is because of

Moderate

A

Reversible nature of reaction between Ag₂S and NaCN
B

Oxidises Na₂S into Na₂SO₄
C

Irreversible nature of reaction between Ag₂S and NaCN
D

None of the above

Solution

Ag₂S+4NaCN⇌2Na[Ag(CN)₂]+Na₂S
The air blown removes sodium sulphide
4Na₂S+5O₂+2H₂O $\to$ 2Na₂SO₄+4NaOH+2S

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