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Coordination Compounds question

2020 · Q84
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Coordination Compounds question

2020 · Q84

NEETChemistryCoordination CompoundsMCQ+4 / −1
The calculated spin only magnetic moment of Cr2+ ion is?
  1. A
    4.90 BM
  2. B
    5.92 BM
  3. C
    2.84 BM
  4. D
    3.87 BM
View written solutionFree

Correct answer: A

Electronic configuration of Cr:[Ar]3d54s1Cr:[Ar]3{d^5}4{s^1}Cr:[Ar]3d54s1

Electronic configuration of Cr2+C{r^{2 + }}Cr2+:[Ar]3d4

No. of unpaired electrons = 4

Spin only magnetic moment = n(n+2)\sqrt {n(n + 2)} n(n+2)​

n = number of unpaired e−-−

Spin only magnetic moment = 4(4+2)\sqrt {4(4 + 2)} 4(4+2)​

= 24\sqrt {24} 24​ BM

= 4.9 BM

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