p-Block elementsHard

Question

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

Options

A.nitrogen
B.oxygen
C.carbon dioxide
D.argon

Solution

Ag dissociates in a solution of NaCN in the presence of air, and forms sodium argentocyanide.
4Ag + 8NaCN + 2H2O + O2 → 4Na[As(CN2)] + 4NaOH

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