Which of the following options are correct for the reaction?
$2 {[Au (CN)_{2}]}^{-} (aq) + Zn (s) \to 2 Au (s) + {[Zn (CN)_{4}]}^{2 -} (aq)$
A. Redox reaction
B. Displacement reaction
C. Decomposition reaction
D. Combination reaction
Choose the correct answer from the options given below:

Question

Which of the following options are correct for the reaction?

$2 {[Au (CN)_{2}]}^{-} (aq) + Zn (s) \to 2 Au (s) + {[Zn (CN)_{4}]}^{2 -} (aq)$

A. Redox reaction

B. Displacement reaction

C. Decomposition reaction

D. Combination reaction

Choose the correct answer from the options given below:

TestHub · Accepted Answer

Gold is then extracted from this complex by displacement technique by using a more electropositive zinc metal.
In this method, zinc ( $Zn$ ) acts as a reducing agent and it reduces $Au^{+}$ to $Au$ and itself gets oxidized from $Zn$ to ${Zn}^{+ 2}$ ions which combine with ${CN}^{-}$ ions and form soluble complex, sodium tetracyanozincate (II).
$2 {[Au (CN)_{2}]}^{-} (aq) + Zn (s) \to 2 Au (s) + {[Zn (CN)_{4}]}^{2 -} (aq)$

Chemistry - Complete d-block Question with Solution | TestHub

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