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Q.

Leaching of gold with dilute aqueous solution of NaCN in presence of oxygen gives complex [A],
which on reaction with zinc forms the elemental gold and another complex [B]. [A] and [B], respectively are :-

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a

Au(CN)2−and Zn(CN)42−

b

Au(CN)4−and Zn(CN)2(OH)22−

c

Au(CN)2−and Zn(OH)42−

d

Au(CN)42− and Zn(CN)64−

answer is C.

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Detailed Solution

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 Au+NaCN→Na[Au(CN)2] Zn+Na[Au(CN)2]→Na2[Zn(CN)4]+Au

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