Question

Native silver metal forms a water solution complex with dilute solution of Na CN in the presence of

Options

• Nitrogen

• Oxygen

• Carbon dioxide

• Carbon

Answer 1

Oxygen

Explanation:

Silver forms a water-soluble complex with NaCN in the presence of air car oxygen.

\[\ce{4Ag + 8NaCN + 2H2O + O2 -> \underset{Soluble complex}{4Na[Ag(CN)2]} + 4NaOH}\]