Q. Bond angles of $NH_{3},\ PH_{3},\ AsH_{3}\$and$\ SbH_{3}$ is in the order
A) $PH_{3} > AsH_{3} > SbH_{3} > NH_{3}$
B) $SbH_{3} > AsH_{3} > PH_{3} > NH_{3}$
C) $SbH_{3} > AsH_{3} > NH_{3} > PH_{3}$
D) $NH_{3} > PH_{3} > AsH_{3} > SbH_{3}$
Explanation
(d)
According to VSEPR theory the bond angle decreases with increase in the size of the valence shell of the central atom because electronegativity decreases. $i.e$., decreasing order of bond angles is
$NH_{3} > PH_{3} > AsH_{3} > SbH_{3}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.