COMEDK Exam 2014 Solved Paper

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Question : 97 of 180

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Sodium cyanide is added as a depressant in the froth floatation process when the ore contains a mixture of ZnS and PbS. This is because

Pb(CN)2 gets precipitated without any effect on ZnS
ZnS forms soluble complex, while PbS forms froth.
PhS forms soluble complex, while ZnS forms froth.
Zn(CN)2 gets precipitated without any effect on PbS

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