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Arrange the following in the order of property indicated for set : NH_3, PH_3 , AsH_3, SbH_3, BiH_3 - increasing base strength . |
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Answer» Solution : Due to the presence of a lone pair of electrons on the central atom in `NH_3, PH_3, AsH_3, SbH_3 and BiH_3` all behave as Lewis bases. As we MOVE from `NH_3 " to " BiH_3` the size of the atom increases. As a result, the lone pair of electrons OCCUPIES a larger volume. Therefore, the electron DENSITY on the central atom decreases and hence the BASIC strength decreases as we move from `NH_3 " to " BiH_3`. INCREASING order of basic strength can be written as: `BiH_3 lt SbH_3 lt AsH_3 lt PH_3 lt NH_3` |
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