Arrange the following metal complex/compounds in the increasing order of spin only magnetic moment. Presume all the three, high spin system.
(Atomic numbers Ce = 58, Gd = 64 and Eu = 63)
(a) \(\mathrm{(NH_4)_2[Ce(NO_3)_6]}\)
(b) \(\mathrm{Gd(NO_3)_3}\) and
(c) \(\mathrm{Eu(NO_3)_3}\)
(Atomic numbers Ce = 58, Gd = 64 and Eu = 63)
(a) \(\mathrm{(NH_4)_2[Ce(NO_3)_6]}\)
(b) \(\mathrm{Gd(NO_3)_3}\) and
(c) \(\mathrm{Eu(NO_3)_3}\)
Show Hint
- (a) < (b) < (c)
- (b) < (a) < (c)
- (a) < (c) < (b)
- (c) < (a) < (b)
The Correct Option is C
Solution and Explanation
(b) \(\mathrm{Gd^{3+}}\) (Z = 64): [Xe]4f7, n = 7, \(\mu=\sqrt{7\times 9}=\sqrt{63}\approx 7.94\) BM.
(c) \(\mathrm{Eu^{3+}}\) (Z = 63): [Xe]4f6, treated as high spin with n = 6, \(\mu=\sqrt{6\times 8}=\sqrt{48}\approx 6.93\) BM.
Order of increasing magnetic moment: (a) < (c) < (b).
Answer: (3) (a) < (c) < (b)
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