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Question

Among the hydrides of Group - 15 elements, which have the:-

A
Lowest boiling point - phosphine.
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B
Maximum basic character - ammonia.
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C
Highest bond angle - ammonia.
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D
All are correct.
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Solution

The correct option is D All are correct.
PH3 has lowest boiling point because NH3 has intermolecular hydrogen bonding and other hydrides hae higher van-der wall forces.

Most basic is ammonia because of highest electron density on nitrogen.

Highest bond angle is in ammonia as nitrogen has highest electron density , repulsion between lone pairs and bond pairs will be more resulting into more bond angle due to small size of nitrogen.

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