The pair having the same magnetic moment is
[at. No. `Cr = 24, Mn = 25, Fe = 26 " and " Co = 27]`

Options

A. `[Mn(H_2 O)_6]^(2+) and [Cr(H_2 O)_6]^(2+)`
B. `[Co(Cl_4]^(2-) and [Fe(H_2 O)_6]^(2+)`
C. `[Cr(H_2 O)_6]^(2+) and [CoCl_4]^(2-)`
D. `[Cr(H_2 O)_6]^(2+) and [Fe(H_2 O)_6]^(2+)`

Answer

D

Explanation

Complex Metal ion Configuration Magnetic moment `mu=sqrt(n(n+2))`

Since (a) and (b) , each has 4 unpaired electron they will have same magnetic moment .