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[Cr(H2O)6]Cl3 (at. no. of Cr = 24) has a magnetic moment of 3.83 B.M. The correct distribution of 3d electrons in the chromium of the complex is

1. 3d⁴ 1, 3d² x²-y², 3d² yz
2. 3d⁴ 1, 3d² yz, 3d² xz
3. 3d⁴ 1, 3d² x²-y², 3d² z²
4. 3d⁴ 2, 3d² x²-y², 3d² xz

Correct answer: 3d⁴ 1, 3d² x²-y², 3d² yz

Solution

The magnetic moment of 3.83 B.M. corresponds to 3 unpaired electrons, indicating that the chromium ion is in the +3 oxidation state (Cr³⁺) with a 3d³ configuration. The distribution of electrons in the d-orbitals aligns with option A.

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