Pblock Elementsii Result Question 20
20. Chlorine acts as a bleaching agent only in the presence of
(1983, 1M)
(a) dry air
(b) moisture
(c) sunlight
(d) pure oxygen
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Answer:
Correct Answer: 20. ( b )
Solution:
Moist chlorine gives nascent oxygen, act as oxidising agent :
$\begin{gathered} \mathrm{Cl}_2+\mathrm{H}_2 \mathrm{O} \longrightarrow \mathrm{HCl}+\mathrm{HOCl} \\ \mathrm{HOCl} \longrightarrow \mathrm{HCl}+\underset{\text{nascent oxygen (bleaching action)}}{[\mathrm{O}]} \end{gathered}$
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