When KMnO_4 solution is added to hot oxalic acid solution, the de… - Vidyadip

MCQ

When $KMnO_4$ solution is added to hot oxalic acid solution, the decolourisation is slow in the beginning but becomes instantaneous after sometime. This is because

✓
$Mn^{+2}$ acts as autocatalyst
B
$CO_2$ is formed
C
Reaction is exothermic
D
$MnO_4^-$ catalyses the reaction

✓

Answer

Correct option: A.

$Mn^{+2}$ acts as autocatalyst

a
Here, KMnO4 is a reactant in the reaction which forms Mn2+ which acts as an
auto-catalyst. The reaction is slow initially because MnO4- is getting converted to Mn2+ but once Mn2+ forms, the reaction becomes faster due to the
catalytic action

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