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Question
The pair having the same magnetic moment is ______.
[At. No.: Cr = 24, Mn = 25, Fe = 26, Co = 27]
Options
[Cr(H2O)6]2+ and [CoCl4]2−
[Cr(H2O)6]2+ and [Fe(H2O)6]2+
[Mn(H2O)6]2+ and [Cr(H2O)6]2+
[CoCl4]2− and [Fe(H2O)6]2+
MCQ
Fill in the Blanks
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Solution
The pair having the same magnetic moment is `bbunderline([Cr(H_2O)_6]^(2+) and [Fe(H_2O)_6]^(2+))`.
Explanation:
- [Cr(H2O)6]2+: Cr2+ has a d4 configuration, leading to 4 unpaired electrons.
- [Fe(H2O)6]2+: Fe2+ has a d6 configuration and also results in 4 unpaired electrons in a high-spin octahedral complex.
Thus, both complexes have the same number of unpaired electrons (4), so their magnetic moments are the same, approximately 4.9 BM.
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