SATHEE: Extraction of Metals - Result Question 29

Extraction of Metals - Result Question 29

####29. In the process of extraction of gold,

Roasted gold ore $+ C N^{-} + H_{2} O \overset{O_{2}}{\to} [X] + H O$

$[X] + Z n ⟶ [Y] + A u$

Identify the complexes $[X]$ and $[Y]$ .

$(2003, 1 M)$

(a) $X = {[A u (C N)_{2}]}^{-}, Y = {[Z n (C N)_{4}]}^{2 -}$

(b) $X = {[A u (C N)_{4}]}^{3 -}, Y = {[Z n (C N)_{4}]}^{2 -}$

(c) $X = {[A u (C N)_{2}]}^{-}, Y = {[Z n (C N)_{6}]}^{4 -}$

(d) $X = {[A u (C N)_{4}]}^{-}, Y = {[Z n (C N)_{4}]}^{2 -}$

Show Answer

Solution:

$\begin{aligned} A u + 2 C N^{-} ⟶ {[A u (C N)_{2}]}^{-} & 2 A u (C N)_{2}^{-} + Z n ⟶ {[Z n (C N)_{4}]}^{2 -} + 2 A u & Y \end{aligned}$

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