Chemistry General Principles and Processes of Isolation of Elements ( Not In Syllabus ) Mix Single Correct MCQ
Published on: August 11, 2026

In the extraction of silver from argentite air is passed through aqueous solution because :

A
it converts Ag 2 S to Ag 2 O.
B
it shifts the reaction equilibrium to forward direction by converting Na 2 S formed into Na 2 SO 4 and sulphur.
C
it converts Ag 2 S into Ag and SO 2 .
D
it helps in removing the excess of CN – ions.

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Text Solution

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The correct answer is:
B

Ag 2 S + 2NaCN 2AgCN + Na 2 S

4Na 2 S + 5O 2 + 2H 2 O — → 2Na 2 SO 4 + 4NaOH + 2S.

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