In extraction of gold and silver, the respective metal is leached with dilute solution of NaCN or KCN in the presence of O 2 . Then the metal is obtained by replacement reaction. If sum of total lin

Question

In extraction of gold and silver, the respective metal is leached with dilute solution of NaCN or KCN in the presence of $O_{2}$ . Then the metal is obtained by replacement reaction.

If sum of total linkage isomers and effective atomic number of all the complexes formed during the complete cyanide process of Gold is (X³ + 1). Then find the value of X?

TestHub · Accepted Answer

The complexes formed during the cyanide process of gold are $[A u (CN)_{2}]^{-}$ and $[Z n (CN)_{4}]^{2 -}$ .

Effective Atomic Number (EAN):

$E A N o f [A u (CN)_{2}]^{-} = 79 - 1 + (2 \times 2) = 82$

$E A N o f [Z n (CN)_{4}]^{2 -} = 30 - 2 + (4 \times 2) = 36$

$T o t a lE A N = 118$

Linkage Isomers: Due to the ambidentate ligand $C N^{-}$ , $[A u (CN)_{2}]^{-}$ exhibits 3 linkage isomers ( $[A u (CN)_{2}]^{-}$ , $[A u (CN) (NC)]^{-}$ , $[A u (NC)_{2}]^{-}$ ), and the tetrahedral $[Z n (CN)_{4}]^{2 -}$ exhibits 5 structural variations. Thus, total linkage isomers = $3 + 5 = 8$ .

$S u m = 118 + 8 = 126$

$X^{3} + 1 = 126$

$X^{3} = 125$

$X = 5$

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