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Q.

 Metals those can be extracted with aqueous solution of sodium cyanide as complexes are

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a

 Au and Ag 

b

 Fe and Ag
 

c

 Au and Hg

d

Hg and Fe

answer is A.

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Detailed Solution

The procedure is known as the Mac-arthur-frost Process, and it involves dissolving the ore in a weak solution of sodium cyanide or potassium cyanide in order to extract the silver and gold from it. Thus, Au and Ag can be extracted with aqueous solution of sodium cyanide as complexes.

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