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Preparations and Uses of Caustic Soda

In presence o...

Question

In presence of air, silver reacts with $K C N$ to form _________.

K_{2} [A g (C N)]_{2}

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K_{6} [A g (C N)]_{2}

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K_{7} [A g (C N)]_{2}

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K [A g (C N)]_{2}

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Solution

The correct option is D $K [A g (C N)]_{2}$ .
In presence of air, silver reacts with $K C N$ to form $K [A g (C N)]_{2}$ .
$4 A g + 8 K C N + 2 H_{2} O + O_{2} \to K [A g (C N)]_{2} + 4 K O H$

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