ChemistryNEET 2021Group 15 and 16: nitrogen, oxygen families

The p-Block Elements

In which one of the following arrangements is the given sequence not strictly according to the property indicated against it?

A.HF < HCl < HBr < HI : increasing acidic strength
B. $H_{2} O < H_{2} S < H_{2} Se < H_{2} Te$ : increasing $p K_{a}$ values✓
C. $N H_{3} < P H_{3} < As H_{3} < Sb H_{3}$ : increasing acidic character
D. $C O_{2} < Si O_{2} < Sn O_{2} < Pb O_{2}$ : increasing oxidising power

You have the answer. The worked solution — and why the other three were written — is part of a paid pack.

More from this chapter in past papers

From Chemistry › The p-Block Elements › Group 15 and 16: nitrogen, oxygen families — lectures, notes and every past question on it.

Last revised 7 Sept 2026. Found a mistake? Tell us — corrections are the fastest thing we act on.

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