Home Chemistry General Principles and Processes of Isolation of Elements ( Not In Syllabus ) General The metal extracted by leaching with a cyani…
Chemistry General Principles and Processes of Isolation of Elements ( Not In Syllabus ) General Single Correct MCQ
Published on: August 12, 2026

The metal extracted by leaching with a cyanide is :

A
Mg
B
Ag
C
Cu
D
Na

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The correct answer is:
B

Silver ore forms a soluble complex when leached with NaCN solution and from which silver is precipitated using scrap zinc.

Ag2S (conc. ore) + 2NaCN 2AgCN + Na2S.

4Na2S + 5O2 + 2H2O 2Na2SO4 + 4NaOH + 2S

Na2S is converted in to Na2SO4 . Hence equilibrium shifts towards right side.

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

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