question_answer 73)

  Explain why  has magnetic moment value of 5.92 BM whereas  has a value of only 1.74 BM?

Answer:

                    As we know,            where,                   = magnetic moment  = number of unpaired electrons It                           = 1.74 i.e., n = 1 and                        = 5.92 i.e., n = 5 .  involves  hybridisation with one unpaired electron (as shown by its magnetic moment 1.74 BM) and  involves  hybridisation with five unpaired electrons (because magnetic moment equal to 5.92 BM).  is stronger ligand than  according to spectrochemical series.  > P for  hence, fourth electron will pair itself. Whereas for water pairing will not happen for  the electronic configuration of  is One unpaired electron For the electronic configuration of  is Five unpaired electron Hence,  and  are inner orbital and outer orbital complex respectively