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General Principles And Processes Of Isolation Of Elements

Question
CBSEENCH12011440
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Extraction of gold and silver involves leaching with CN– ion. Silver is later recovered by

  • Liquation

  • Distillation

  • Zone refining

  • Displacement with Zn

Solution

D.

Displacement with Zn

4 space Ag space plus space 8 NaCN space plus space 2 straight H subscript 2 straight O space plus space straight O subscript 2 space rightwards arrow with Leaching on top stack space 4 Na left square bracket Ag left parenthesis CN right parenthesis subscript 2 right square bracket with soluble space sodium space dicyanoargentate space left parenthesis left parenthesis right parenthesis below space plus space 4 NaOH 2 Na left square bracket Ag left parenthesis CN right parenthesis subscript 2 right square bracket space plus space Zn space rightwards arrow with Displacement on top space Na subscript 2 left curly bracket Zn left parenthesis CN right parenthesis subscript 4 space plus space 2 Ag

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