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A sample of galena (PbS) is contaminated...

A sample of galena (PbS) is contaminated with zinc blende (ZnS). Name one chemical which can be used to concentrate galena selectively by froth floatation method?

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Sodium cyanide. It"reacts with ZnS to form a complex .Na_1^4[Zn(CN)_4]_1. thus preventing it from forming the froth. Now only. PbS fornis froth and hence can be separated from ZnS impurity.
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