1.

The basic character of hydrides of the 15th-group elements decreases in the order

Answer»

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

SOLUTION :`NH_(3) gt PH_(3) gt AsH_(3) gt SbH_(3)`
On MOVING down the group atomic size increases and AVAILABILITY of lone pair decreases. Hence, basic CHARACTER decreases,


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