The metal extracted by leaching with a cyanide is:

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Leaching is often used if the ore is soluble in some suitable solvent. In the metallurgy of silver and that of gold, the respective metal is leached with a dilute solution of NaCN or KCN in the presence of air (for

O_{2}

) from which the metal is obtained later by replacement.

4 M (s) + 8 C N^{-} (a q) + 2 H_{2} O (a q) + O_{2} (g) \to 4 [M (CN)_{2}]^{-} (a q) + 4 O H^{-} (a q)

(M = Ag or Au)

2 [M (CN)_{2}]^{-} (a q) + Z n (s) \to [Z n (CN)_{4}]^{2 -} (a q) + 2 M (s)

Hence, option B is correct.

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Question Text	The metal extracted by leaching with a cyanide is:
Answer Type	Text solution:1
Upvotes	150

The metal extracted by leaching with a cyanide is:

Text solutionVerified

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