In Mac-arthur forest process, crude Au is separated in the last step along with a compound of zinc. Which is/are TRUE for that compound.

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In the Mac-Arthur Forest process, gold is extracted by cyanide leaching and precipitated using zinc:

$2 [A u (CN)_{2}]^{-} + Z n \to [Z n (CN)_{4}]^{2 -} + 2 A u$

The compound formed is $[Z n (CN)_{4}]^{2 -}$ . It has tetrahedral geometry, so it does not show geometrical or optical isomerism.

Its EAN = $30 (Z n) + 4 (2) = 38$ , which is equal to Kr, so it follows Sidgwick EAN rule. It can show structural isomerism due to the linkage isomerism possibility of the CN⁻ ligand.

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