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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
$$Ag$$ reacts in a solution of $$NaCN$$ in the presence of air and forms sodium argentocyanide.

$$4Ag+8NaCN+2H_{2}O+O_{2} \to 4Na[Ag(CN)_{2}]+4NaOH$$

Chemistry

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