Question

The reaction,
$\left(\text{M}\right)^{\text{2+}} \left(\text{aq}\right) \text{+M} \left(\text{s}\right) \rightleftharpoons \left(\text{2M}\right)^{\text{+}} \left(\text{aq}\right)$
is an example of:

• A. Reduction
• B. Oxidation
• C. Comproportionation
• D. Disproportionation

Answer 1

Answer: (C)

The reaction, in which two or more species undergo reduction as well as oxidation to give a single species are called comproportionation reaction. This is reverse of disproportionation reaction.
$\left(\text{M}\right)^{\text{2+}} \left(\text{aq}\right) \text{+M} \left(\text{s}\right) \rightleftharpoons \left(\text{2M}\right)^{\text{+}} \left(\text{aq}\right)$
Reduction $\text{M}^{+ 2} + \text{e}^{-} \rightarrow \text{M}$
$\text{M} \rightarrow \text{M}^{+} + \text{e}^{-}$