Suggest the expected shape of the following molecules with reasons a.SO2 b.NH3

Suggest the expected shape of the following molecules with reasons
 a.SO2
 b.NH3
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1 Answer

Answer :

Ans.(a) In SO2 molecule there are three electron pairs .the three electron pairs should acquire trigonal planar arrangement with bond angle 120 ° .Since one of the position is occupied by lone pair the geometry is described as V-shaped or bent shaped.
(b) In NH3 molecule there are are four electron pairs (three bond pairs and one lone pair) .These four electron pairs adopt tetrahedral geometry but due to the repulsion by lone pair the bond decreases to 107 ^0 from 109.5^ 0 and hence the geometry of ammonia is regarded as pryamidal.
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