JEE Advanced · 2012 · 08 Apr 2012 · Paper 2 · p-Block Elements

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Bleaching powder and bleach solution are produced on a large scale and used in several household products. The effectiveness of bleach solution is often measured by iodometry.

Bleaching powder contains a salt of an oxoacid as one of its components. The anhydride of that oxoacid is

(A) $Cl_{2} O$ ✓ Correct
(B) $Cl_{2} O_{7}$
(C) $ClO_{2}$
(D) $Cl_{2} O_{6}$

Answer: (A)

Solution

Bleaching powder is Ca(OCl)Cl, which contains the hypochlorite ion (OCl⁻). The corresponding oxoacid is hypochlorous acid (HOCl). The anhydride of HOCl is formed by removing water from two molecules: 2HOCl → H₂O + Cl₂O. The answer is (A).

JEE Advanced · 2012 · 08 Apr 2012 · Paper 2 · Single correct option

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