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  4. Native silver metal forms a water soluble complex with a dilute aqueous solution of NaCN in the presence of

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Q. Native silver metal forms a water soluble complex with a dilute aqueous solution of $NaCN$ in the presence of

IIT JEEIIT JEE 2008The d-and f-Block Elements

Solution:

A water soluble complex with silver and dilute aqueous solution of NaCN is $Na[Ag(CN)_2)$ In the cyanide process, the native silver is crushed and treated with aqueous NaCN solution and aerated.
$4Ag+8NaCN+2H_2O+O_2\rightarrow 4Na[Ag(CN)_2]+4NaOH$