JEE CHEMISTRY MCQ: GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

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By froth flotation process a mixture of

ZnS

and

PbS

can be separated by adding

NaCN

to form a complex 'X'. The complex is

View answer and explanation

Correct option: C

N{a_2}\left[ {Zn{{\left( {CN} \right)}_4}} \right]

The correct answer is C (

N{a_2}[Zn{(CN)_4}]

) because NaCN selectively reacts with ZnS to form this complex, preventing it from forming froth.

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