Question

In oxidation of oxalic acid by KMn$O_{4}$, the colour of KMn$O_{4}$ disappears slowly at the start of reaction but disappears very fast afterwards. This is an example of

• A. induced catalysis
• B. auto-catalysis
• C. negative catalysis
• D. enzyme catalysis.

Answer 1

Answer: (B)

auto-catalysis

Answer 2

In the oxidation of oxalic acid by KMn$O_{4},$ the colour of KMn$O_{4}$ disappears slowly in the beginning but disappears faster after sometime due to the formation of $Mn^{2+}$ ions which act as auto-catalyst for the reaction.