One gas bleaches the colour of flowers by reduction, while the other by oxidation

One gas bleaches the colour of flowers by reduction, while the other by oxidation
  1. $\mathrm{CO}$ and $\mathrm{Cl}_{2}$
  2. $\mathrm{SO}_{2}$ and $\mathrm{Cl}_{2}$
  3. $\mathrm{H}_{2} \mathrm{~S}$ and $\mathrm{Br}_{2}$
  4. $\mathrm{NH}_{3}$ and $\mathrm{SO}_{2}$

Solution

$\mathrm{SO}_{2}$ bleaches by reduction, while chlorine bleaches colour of flowers by oxidation.

Asked in: JEE-TOPICTESTS-CHEMISTRY

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