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NEET 2014

Exam: NEET
Year: 2014
Subject: Chemistry
Chapter: p Block Elements (Group 15, 16, 17 & 18)

NEET 2014 · Chemistry · p Block Elements (Group 15, 16, 17 & 18)

Acidity of diprotic acids in aqueous solutions increases in the...

Acidity of diprotic acids in aqueous solutions increases in the order:

Options

A ${H}_{2}S < {H}_{2}Se < {H}_{2}Te$
B ${H}_{2}Se < {H}_{2}S < {H}_{2}Te$
C ${H}_{2}Te < {H}_{2}S < {H}_{2}Se$
D ${H}_{2}Se < {H}_{2}Te < {H}_{2}S$

Correct answer

A. ${H}_{2}S < {H}_{2}Se < {H}_{2}Te$

Step-by-step solution

Acidic strength for a particular group is inversely proportional to the bond energy and directly proportional to the bond length.

${{H}_{2}O < H}_{2}S < {H}_{2}Se < {H}_{2}Te$ (acidic strength)

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