Question

Dipole moment of the hydrides of group 15 elements decreases in the order –

• A. $AsH_{3} > BiH_{3} > SbH_{3} > NH_{3} > PH_{3}$
• B. $BiH_{3} > SbH_{3} > AsH_{3} > PH_{3} > NH_{3}$
• C. $NH_{3} > PH_{3} > AsH_{3} > SbH_{3} > BiH_{3}$
• D. $PH_{3} > NH_{3} > AsH_{3} > SbH_{3} > BiH_{3}$

Answer 1

Answer: (C)

$NH_{3} > PH_{3} > AsH_{3} > SbH_{3} > BiH_{3}$

Answer 2

Dipole moment of$MH_{3}$decreases down the group as the electronegativity of the central atom M decreases.