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Which of the following hydeides has the ...

Which of the following hydeides has the lowest boiling point?

A

`AsH_3`

B

`SbH_3`

C

`NH_3`

D

`PH_3`

Text Solution

Verified by Experts

The correct Answer is:
D
The correct order of boiling point is
`SbH_3gtNH_3gtAsH_3gtPH_3`
The boiling point of covalent hydrides usually increases with molecular mass `(PH_3 lt ASH_3 lt SbH_3)`. Unusually high boiling point of `NH_3` is due to intermolecular hydrogen bonding.
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