Leaching of Ag 2 S is carried out by heating it with a dilu…

Chemistry General Principles and Processes of Isolation of Elements ( Not In Syllabus ) General Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: August 13, 2026

Leaching of Ag 2 S is carried out by heating it with a dilute solution of :

NaCN only

HCI

NaOH

NaCN in presence of O 2

Text Solution

Verified by Experts

The correct answer is:

Ag 2 S (conc. ore) + 2NaCN 2AgCN + Na 2 S.

Ag 2 S and AgCN are in equilibrium so Na 2 S is oxidised by air in to Na 2 SO 4 . Hence equilibrium shifts towards right side.

4Na 2 S + 5O 2 + 2H 2 O ⎯→ 2Na 2 SO 4 + 4NaOH + 2S

AgCN + NaCN ⎯→ Na[Ag(CN) 2 ] (soluble complex)

2Na[Ag(CN) 2 ] + Zn (dust) ⎯→ 2Ag ↓ + Na 2 [Zn(CN) 4 ].

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