One gas bleaches the colour of flowers by reduction, while the othe...

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One gas bleaches the colour of flowers by reduction, while the other by oxidation, the two gases respectively are:
(a) \( \mathrm{CO} \) and \( \mathrm{Cl}_{2} \)
(b) \( \mathrm{H}_{2} \mathrm{~S} \) and \( \mathrm{Br}_{2} \)
(c) \( \mathrm{NH}_{3} \) and \( \mathrm{SO}_{3} \)
(d) \( \mathrm{SO}_{2} \) and \( \mathrm{Cl}_{2} \)
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