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Question

The compound which does not react with KMnO4 is :
  1. perdisulphuric acid.
  2. sulphurous acid.
  3. hydrogen sulphide.
  4. hydrogen peroxide.

A
hydrogen peroxide.
B
hydrogen sulphide.
C
sulphurous acid.
D
perdisulphuric acid.
Solution
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In perudisulphuric acid (shown in the figure), S is in its highest oxidation state (+6) and so, it can not reduce KMnO4 and itself get oxidised further.
However, all other given reagents can reduce KMnO4.

162000_164078_ans.png

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