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Arrange the following metal complex/compounds in the increasing order of spin only magnetic moment. Resume all the three, high spin system. (Atomic masses Ce = 58, Gd = 64 and Eu = 63.) (a) (NH4)2[Ce(NO3)6] (b) Gd(NO3)3 and (c) Eu(NO3)3 Answer is :

1. (1) (b) < (a) < (c)
2. (2) (c) < (a) < (b)
3. (3) (a) < (b) < (c)
4. (4) (a) < (c) < (b)

Correct answer: (2) (c) < (a) < (b)

Solution

The correct order of increasing spin-only magnetic moment is determined by the number of unpaired electrons in each complex. Gd(NO3)3 has the least unpaired electrons, followed by (NH4)2[Ce(NO3)6], and finally Eu(NO3)3, which has the most unpaired electrons, leading to the order (c) < (a) < (b).

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