1.

Of the following hydrides which one has the lowest boiling point ?

Answer»

`AsH_(3)`
`SbH_(3)`
`PH_(3)`
`NH_(3)`

SOLUTION :`NH_(3)` undergoes H-bonding and hence has the highest b.p. Among the remaining hydrides i.e. `PH_(3) ASH_(3) and SbH_(3)` as we MOVE from `PH_(3)` to `BiH_(3)` the molecular MASS increases. As a result the van der Waal.s forces of attraction increases and the boiling point increases regularly from `PH_(3)` to `BiH_(3)`


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