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Question:

The correct order of the spin-only magnetic moment of metal ions in the following low spin complexes, [V(CN)_6]^4-, [Fe(CN)_6]^4-, [Ru(NH_3)_6]^3+, and [Cr(NH_3)_6]^2+, is:

V^2+ > Cr^2+ > Ru^3+ > Fe^2+

V^2+ > Ru^3+ > Cr^2+ > Fe^2+

Cr^2+ > V^2+ > Ru^3+ > Fe^2+

Cr^2+ > Ru^3+ > Fe^2+ > V^2+

Solution:

Correct option is A. V^2+ > Cr^2+ > Ru^3+ > Fe^2+
Solution:- (A) V^2+ > Cr^2+ > Ru^3+ > Fe^2+
According to equations, all the complexes are low spin.
Complex Configuration No. of unpaired electrons
[V(CN)_6]^4- t_2g ^3e_g^0 3
[Cr(NH_3)_6]^2+ t_2g ^4e_g^0 2
[Ru(NH_3)_6]^3+ t_2g ^5e_g^0 1
[Fe(CN)_6]^4- t_2g ^6e_g^0 0