A) oxidation of\[NO\]to\[N{{O}_{2}}\]
B) oxidation of\[S{{O}_{2}}\]to\[S{{O}_{3}}\]
C) decomposition of\[KCl{{O}_{3}}\]to\[KCl\]and\[{{O}_{2}}\]
D) oxidation of oxalic acid by acidified\[KMn{{O}_{4}}\]
Correct Answer: D
Solution :
Autocatalysis is a process in which one of the product behaves as a catalyst. e.g., \[2KMn{{O}_{4}}+5{{H}_{2}}{{C}_{2}}{{O}_{4}}+3{{H}_{2}}S{{O}_{4}}\xrightarrow[{}]{{}}\] \[{{K}_{2}}S{{O}_{4}}+\underset{(acts\text{ }as\text{ }catalyst)}{\mathop{2MnS{{O}_{4}}}}\,+8{{H}_{2}}O+10C{{O}_{2}}\] The pink colour of KMn04 disappears slowly on reaction with oxalic acid, but the rate of disappearance of colour fastens after some time due to the formation of\[MnS{{O}_{4}}\]which acts as auto catalyst for the reaction.
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