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(51)Describe the hybridisation in case of PCl5. Why are the axial bonds
               longer as compared to equatorial bonds ?

               (32)Define hydrogen bond. Is it weaker or stronger than the van der
               Waals forces?

               (53)What is meant by the term bond order ? Calculate the bond order
               of : N2, O2, O2 and O2
                                          2-
                                 +
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