JEE Advanced Chemistry question

There are three unpaired electrons in and calculated value of magnetic moment is 3.87 BM which is quite different from the experimental value of 4.40 BM. This is because of

(A)Increase in number of unpaired electrons
(B)Some contribution of the orbital motion of the electron to the magnetic momentCorrect
(C)Change in orbital spin of the electron
(D)d-d* transition

Answer: (B)

Solution

As explained for the identical Q419, the spin-only formula ignores orbital angular momentum. High-spin () in an octahedral field has a -term ground state, in which orbital angular momentum is not fully quenched, so it contributes an additional component to the total

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Question ID VK-159773