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An example of autocatalysis is...

An example of autocatalysis is

A

Oxidation of NO to `NO_(2)`

B

Oxidation of `SO_(2)` to `SO_(3)`

C

Decomposition of `KlClO_(3)` to KCl and `O_(2)`

D

Oxidation of oxalic acid by acidified `KMnO_(4)`

Text Solution

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The correct Answer is:
D
`2KMnO_(4) +5H_(2)C_(2)O_(4)+3H_(2)SO_(4) to K_(2)SO_(4) +2MnSO_(4) + 8H_(2)O + 10CO_(2)`
The pink colour of `KMnO_(4)` disappears slowly on treating it with oxalic acid, but the rate of disappearance of colour fastens after sometime due to the formation of `Mn^(2+)` ions which acts as autocatalyst for the reaction.
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