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Q.
The reaction
$ Ag^{2+}(aq)+Ag(s) \leftrightharpoons 2Ag^{+}(aq) $
is an example of
AMUAMU 2005
Solution:
Oxidation : - A chemical change during which an atom or ion loses electrons is called oxidation or increase in oxidation number is called oxidation.
Reduction :- A chemical change in which an atom or ion gains electrons is called reduction or decrease in oxidation number is called reduction.
Disproportionation :- If a molecule acts both as oxidising agent as well as reducing agent, then it is called auto-oxidise and the process as auto-oxidation or disproportionation.
eg, $ 2Pb(NO_3)_2 \xrightarrow{\text{Heat}} 2PbO + 4NO_2 + O_2$
or $\underset{+5 -2}{NO^-_3} \to \underset{+4 -2}{NO_2} + \underset{0}{O_2}$
Here $ NO_{3}^{-} $ is acting as an oxidising and reducing agent.
Here $Ag$ is oxidised into $ Ag^{+} $ and $ Ag^{2+} $ is reduced into $ Ag^{+} $ .
Hence, those reaction in which two or more species undergo oxidation as well as reduction is called comproportionation.
