Which of the following options are correct for the reaction?
$2{\left[Au ( CN{)}_{2}\right]}^{-} ( aq ) + Zn ( s ) \to 2Au ( s ) + {\left[Zn ( CN{)}_{4}\right]}^{2 -} ( aq )$
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?

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

A. Redox reaction

B. Displacement reaction

C. Decomposition reaction

D. Combination reaction

Choose the correct answer from the options given below:

Quantrex Academy · Accepted Answer

Correct answer: C. A and B only

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

Which of the following options are correct for the reaction? 2 [Au...

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Correct answer

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