NaCN is sometimes added in the froth flotation process as a…

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

NaCN is sometimes added in the froth flotation process as a depressant when ZnS and PbS minerals are expected because

Pb(CN)2 is precipitated while no effect on ZnS.

ZnS forms soluble complex Na2[Zn(CN)4] while PbS forms froth

PbS forms soluble complex Na2[Pb(CN)4] while ZnS forms froth.

NaCN is never added in froth floatation process.

Text Solution

Verified by Experts

The correct answer is:

ZnS + 4NaCN → Na2[Zn(CN)4] + Na2S

PbS + NaCN → No such complex formation.

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