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Chemical Bonding and Molecular Structure
VSEPR Theory: Bond Angles
1 question from 1 paper, each with its answer.
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Concepts tested
- Effect of lone pairs on bond angle
All Questions
2001 AIPMT 1 question
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In which of the following bond angle is maximum :$NH_4^+$: 4 bond pairs, no lone pair, regular tetrahedron, bond angle $109^\circ 28'$.
$NH_3$: 3 bp + 1 lp, the lone pair compresses the angle to about $107^\circ$.
$PCl_3$: 3 bp + 1 lp, angle about $100^\circ$ (P is larger and less electronegative).
$SCl_2$: 2 bp + 2 lp, angle about $103^\circ$.
So the bond angle is maximum in $NH_4^+$.