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Chemistry S and P - Block Elements (S - Block Elements Not In Syllabus ) NTA Abhiyas Question - P Block Elements Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: August 14, 2026

Which Of the following orders is correct?

(1) SbH 3 > NH 3 > AsH 3 > PH 3 - Boiling Point

(2) NH 3 > PH 3 > AsH 3 > SbH 3 - Thermal Stability

(3) NH 3 > PH 3 > AsH 3 > SbH 3 - Basic Character

(4) NH 3 > PH 3 > AsH 3 > SbH 3 - Bond Angle

(1), (2) and (3) only

(2), (3) and (4) only

(1), (3) and (4) only

(1), (2), (3) and (4).

Text Solution

Verified by Experts

The correct answer is:

(1) NH 3 has higher boiling point than AsH 3 and PH 3 on account H -bonding. SbH 3 has highest boiling point on account of highest molecular weight.

(2) As the size of element increases, the strength of M-H bond decreases and thus stability decreases.

(3) Basicity decreases down the group. (Drago rule).

(4) HEH angle (° ): NH 3 = 107.8; PH 3 = 93.6, AsH 3 = 91.8; SbH 3 = 91.3.

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