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Q 2651645524.     (a) Draw the molecular structures of following compounds:
(b) Explain the following observations:
(i) The molecules `NH_3` and `NF_3` have dipole moments which are of opposite direction.
(ii) All the bonds in `PCl_5` molecule are not equivalent.
(iii) Sulphur in vapor state exhibits paramagnetism.
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)