1.

Explain why `NH_(3)` is basic while `BiH_(3)` is only feebly basic ?

Answer» Both N in `NH_3` and `Bi` in `BiH_3` have a lone pair of electrons. Since the atomic size of N is less than Bi and N is more electronegative than Bi Hence electron density is more on N in `NH_3` than on Bi in `BiH_3`. Consequently the tendency to donate its lone pair is more in `NH_3` hence `NH_3` is more basic than `BiH_3`.


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