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Question

Which one of the following complex or ion is paramagnetic?

A
Ni(CO)4
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B
K4[Fe(CN)6]
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C
[Cr(NH3)6]3+
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D
[Ni(CN)4]2
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Solution

The correct option is C [Cr(NH3)6]3+
[Cr(NH3)6]3+
24Cr4s13d5
Cr3+4s03d3
(Refer to Image 1)
NH3 being weak ligand, pairing of es does not occur.
[Cr(NH3)6]3+ (Refer to Image 2)
3 unpaired es are present
It is paramagnetic.
Anwer is option C.

1021178_1072550_ans_c93e765cc31f441db06b826064a01c29.png

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