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Native silver...

Question

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

A

Nitrogen

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B

Oxygen

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C

Carbon dioxide

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D

Argon

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Solution

The correct option is B Oxygen
Native (impure) metal is leached with $N a C N$ in the presence of $O_{2}$ to form a $[A g (C N)_{2}]^{-}$ complex.

From this complex, silver is precipitated out by using metallic Zinc dust.

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