Silver is displaced when zinc is added to aqueous sodium argentocyanide. This method of extracting silver is an example of :

leaching

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hydrometallurgy

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pyrometallurgy

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liquation

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Solution

The correct option is B hydrometallurgy
Hydrometallurgy is used to obtain crude metal from roasted ore. In hydrometallurgy, silver present in its ore is dissolved in $0.5 %$ solution of sodium cyanide in the presence of air. Water soluble sodium argentocyanide is obtained. After that, zinc and magnesium are added to its aqueous solution which extracts silver metal.
Reaction involved :
$2 N a [A g (C N)_{2}] + Z n \to N a_{2} [Z n (C N)_{2}] + 2 A g$

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