1.

The decreasing basic order of the followingcompounds is: i. NH_(3), ii. PH_(3), iii. AsH_(3), iv. SbH_(3)

Answer»

`(i) gt (ii) gt (iii) gt (iv)`
`(iv) gt (iii) gt (ii) gt (i)`
`(ii) gt (i) gt (iii) gt (iv)`
`(ii) gt (i) gt (iv) gt (iii)`

SOLUTION :The basic character of hydrides of 15 groups DECREASES dwon the perodic table becausesize increases down the GROUP and `LP overline(e)'s` density decreases.
NH_(3) gt PH_(3) gt AsN_(3) gt Sbh_(3)`.


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