The magnetic moment is associated with its spin angular momentum and orbital angular momentum. Spin only magnetic moment value of Cr3+ ion is

1.  2.87 BM

2.  3.87 BM

3.  3.47 BM

4.  3.57 BM

NEETprep Answer: 
The magnetic momentis associated with its spin angular momentum and orbital angular momentum.
Spin only magnetic momentvalue of Cr3+ ion is 3d3
 
Hence, magnetic moment (μ) = n(n+2)BM
     = 3(3+2) = 15
      = 3.87BM