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

 2050  212 Surface Chemistry Report Error

Solution:

In the oxidation of oxalic acid by KMn the colour of KMn disappears slowly in the beginning but disappears faster after sometime due to the formation of ions which act as auto-catalyst for the reaction.