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Arrange the following metal complex/comp...

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) `(NH_(4))_(2)[Ce(NO_(3))_(6)] " " (b) Gd(NO_(3))_(3) and " " (c) Eu(NO_(3))_(3)`

A

(C) lt (A) lt (B)

B

(B) lt (A) lt (C)

C

(A) lt (C) lt (B)

D

(A) lt (B) lt (C)

Text Solution

Verified by Experts

The correct Answer is:
C
(A) `""_58Ce to [Xe]4f^2 5d^0 6s^2`
In complex `Ce^(4+) to [Xe]4f^0 5d^0 6s^0`
There is no unpaired electron so `mu_m = 0`
(B) `""_64Gd^3 to [Xe]4f^7 5d^0 6s^0`
Contain seven unpaired electrons so,
`mu_m = sqrt(7 (7 + 2)) = sqrt63B.M.`
(C) `""_63Eu^(3+) to [Xe]4f^6 5d^0 6s^0`
Contain six unpaired electron
So, `mu_m = sqrt(6(6 + 2)) = sqrt48 B.M.`
Hence, order of spin only magnetic moment
`B gt C gt A.`
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