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  4. The role of added sodium cyanide and alkali in the separation of galena from zinc blende and iron sulphide is

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Q. The role of added sodium cyanide and alkali in the separation of galena from zinc blende and iron sulphide is

General Principles and Processes of Isolation of Elements

Solution:

By depressing the floating property of $ZnS$ and $FeS _{2},$ galena alone is carried up in the froth.