Question

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

• A. 3d¹_x²-y², 3d¹_z², 3d¹_xz
• B. 3d¹_xy, 3d¹_x²-y², 3d¹_yz
• C. 3d¹_xy, 3d¹_zy, 3d¹_xz
• D. 3d¹_xy, 3d¹_yz, 3d¹_z²

Answer 1

The Correct Option is C

[Cr(H₂O)₆]Cl₃, with a chromium atom having an atomic number of 24, exhibits a magnetic moment measuring 3.83 B.M. The correct arrangement of chromium's 3d electrons within the complex is as follows: 3d¹_xy, 3d¹_zy, 3d¹_xz.
The magnetic moment value of 3.83 B.M. is indicative of the presence of 3 unpaired electrons in the system. This determination was made using the formula 3.83 = n(n+2), which yields a value of n=3. All these unpaired electrons are situated in the t²g orbitals, corresponding to 3d¹_xy, 3d¹_yz, and 3d¹_xz.