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Oxyacids of Phosphorus

During chlori...

Question

During chlorination process, aqueous (aq) chlorine reacts rapidly with water to form $C l^{-}, H O C l, a n d H^{+}$ as shown below

$C l_{2} (a q) + H_{2} O ⇌ H O C l + C l^{-} + H^{+}$

The most active disinfectant in the chlorination process from amongst the following, is

H O C l

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H^{+}

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H_{2} O

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C l^{-}

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Solution

The correct option is A $H O C l$

At pH<5 chlorine does not react with water and remains as free chlorine.

$(H O C l + O C l^{-} + C l_{2})$ are combinedly called freely available chlorine. Out of these forms of freely available chlorine, (HOCl) is most destructive. It is 80% more effective than $O C l^{-}$ ion.
Hence, pH of water should be maintained slightly below 7.

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