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Elements of Groups 16, 17 and 18 — Chemistry STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceChemistryElements of Groups 16, 17 and 182 Marks
Question
Explain the bleaching action of chlorine.
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Answer

(i) Chlorine acts as a powerful bleaching agent due to its oxidising nature.
(ii) In moist conditions or in the presence of water it forms unstable hypochlorous acid, HOCl which decomposes giving nascent oxygen which oxidises the vegetable colouring matter of green leaves, flowers, litmus, indigo, etc.
$\begin{aligned} & Cl 2+ H 2 O \rightarrow HCl + HOCl
\\ & HOCl \rightarrow HCl +[ O ]\end{aligned}$
Vegetable coloured matter + [O] → colourless matter.

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