Which of the following is used to dissolve argentite ore?

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

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N a C N

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N a C l

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H C l

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Solution

The correct option is B $N a C N$
To dissolve argentite ore, NaCN is used.
The process is Mac Arthur process.
Silver sulphide reacts with NaCN to form soluble complex.
Silver is then precipitated with scap zinc.

$A g_{2} S + 2 N a C N ⇌ N a_{2} S + 2 A g C N ↓$

$A g C N + N a C N \to N a [A g (C N)_{2}]$

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The pH of 0.1 M solution of the following salts increases in the order

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