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Laboratory Preparation of Ammonia

In disinfecti...

Question

In disinfection, which of the following forms of chlorine is most effective in killing the pathogenic bacteria

A

H O C l

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B

C l

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C

N H_{2} C l

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D

O C l^{-}

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Solution

The correct option is A $H O C l$
$H O C l, O C l^{-}$ and $C l_{2}$ are called freely available chlorine.

Out of these forms, HOCl is most reactive and is 80% more effective than $O C l^{-}$ .

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Q. Chlorine gas used for disinfection combines with water to form hypochlorous acid (HOCI). The HOCl ionizes to form hypochlorite

(O C l^{-})

in a reversible reaction:

H O C l \leftrightarrow H^{+} + O C L^{-} (k = 2.7 \times 10^{- 8} a t 20^{\circ} C)

the equilibrium of which is governed by pH. The sum of HOCl and

O C l^{-}

is known as free chlorine residual and HOCl is the more effective disinfectant. The 90%, fraction of HOCl in the free chlorine residual is available at a pH value

Q. is most commonly used as disinfectant for killing bacteria in water?

Q. During chlorination process, aqueous (aq) chlorine reacts rapidly with water to form

C l^{-}, H O C l, a n d H^{+}

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

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