Question

The bond angle decreases from $N{H}_3$ to $Bi{H}_3$ due to:

• A. the decrease in basic strength
• B. the decrease in bond dissociation energy
• C. the decrease in electronegativity of the centalatom
• D. all of these

Answer 1

The correct option is C the decrease in electronegativity of the centalatom

The bond angle decreases from $N{H}_3$ to $Bi{H}_3$ as we from top to bottom due to decrease in the electronegativity of central atom.

As the electronegativity of central atom decreases the bond angle of the molecule decreases.

Hence option C is correct.