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5. Co-ordination chemistry — Chemistry STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceChemistry5. Co-ordination chemistry1 Mark
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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