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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

`(a) lt (c) lt (b)`

C

`(b) lt (a) lt (c)`

D

`(a) lt (b) lt (c)`

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