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Assign a reason for each of the following: (i) Ammonia is a stronger base than phosphine. (ii) Sulphur in vapour state exhibits a paramagnetic behaviour. |
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Answer» Solution :(i) Both ammonia and PHOSPHINE have pyramidal STRUCTURE and both have a lone pair of electrons on N and P. Nitrogen being smaller than phosphorus, electron density of the lone pair on N in `NH_3` is more. Therefore, ammonia is a STRONGER base than phosphine. (ii) Sulphur in the VAPOUR phase exists as `S_2`. S has electronic configuration :  Due to presence of two UNPAIRED electrons in antibonding p* orbitals, it is paramagnetic. |
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