question_answer 58)

    Atomic number of Mn, Fe, Co and Ni are 25, 26, 27 and 28 respectively. Which of the following outer orbital octahedral complexes have same number of unpaired electrons? (a)                     (b) (c)                         (d)  

Answer:

                    (a, c) Molecular orbital electronic configuration ofin  is Number of unpaired electrons = 4 Magnetic property = Paramagnetic Molecular orbital electronic configuration of  in  is Number of unpaired electrons = 4 Magnetic property = Paramagnetic Molecular orbital electronic configuration of  in  is Number of unpaired electrons = 5 Magnetic property = Paramagnetic Molecular orbital electronic configuration of in  is Number of unpaired electrons =2. Magnetic property = Paramagnetic Thus,  and  are paramagnetic having four electrons each. Hence, correct choices are (a) and (c).