JEE Main · 2014 · 06 Apr 2014 · Offline · p-Block Elements

Among the following oxoacids, the correct decreasing order of acid strength is:

(A) $HClO_{4} > HClO_{3} > HClO_{2} > HOCl$ ✓ Correct
(B) $HClO_{2} > HClO_{4} > HClO_{3} > HOCl$
(C) $HOCl > HClO_{2} > HClO_{3} > HClO_{4}$
(D) $HClO_{4} > HOCl > HClO_{2} > HClO_{3}$

Answer: (A)

Solution

The strength of a chlorine oxoacid grows as the oxidation state of the chlorine rises, because more oxygens pull harder on the

O - H

bond and let the proton go more easily. The oxidation states run

+ 1

HOCl

+ 3

HClO X_{2}

+ 5

HClO X_{3}

and

+ 7

HClO X_{4}

, so acid strength falls as

HClO X_{4} > HClO X_{3} > HClO X_{2} > HOCl

JEE Main · 2014 · 06 Apr 2014 · Offline · Single correct option

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