Among the following complexes, the one which shows zero crystal field stabilisation energy (CFSE) is

Question

Among the following complexes, the one which shows zero crystal field stabilisation energy (CFSE) is (A) [Mn(H2 O)6]3+ (B) [Fe(H2O)6]3+ (C) [Co (H2O)6]2+ (D) Co (H2O)6]3+

Tardigrade Admin · Accepted Answer

The CFSE for octahedral complex is given by
CFSE

= [- 0.4 t_{2 g} e^{-} + 0.6 e_{g} e^{-}]

For

M n^{3 +}, [3 d^{4}] \to t_{2 g}^{3} e_{g}^{1}

∴ CFSE = [(- 0.4 \times 3) + (0.6 \times 1)] = - 0.6

For

F e e^{3 +}, [3 d^{5}] \to t_{2 g}^{3} e_{g}^{2}

CFSE

= [- (0.4 \times 3) + (0.6 \times 2)] = 0

For

C^{2 +}, [3 d^{7}] \to t_{2 g}^{5} e_{g}^{2}

CFSE

= [(- 0.4 \times 5) + (2 \times 0.6)] = 0

= - 0.8

For

C o^{3 +}, [3 d^{6}] \to t_{2 g}^{4} e_{g}^{2}

CFSE

= [(- 0.4 \times 4) + (2 \times 0.6)]

= - 0.4

Q. Among the following complexes, the one which shows zero crystal field stabilisation energy (CFSE) is

$[M n (H_{2} O)_{6}]^{3 +}$

$[F e (H_{2} O)_{6}]^{3 +}$

$[C o (H_{2} O)_{6}]^{2 +}$

$C o (H_{2} O)_{6}]^{3 +}$

Q. Among the following complexes, the one which shows zero crystal field stabilisation energy (CFSE) is

[Mn(H2​O)6​]3+

[Fe(H2​O)6​]3+

[Co(H2​O)6​]2+

Co(H2​O)6​]3+

$[M n (H_{2} O)_{6}]^{3 +}$

$[F e (H_{2} O)_{6}]^{3 +}$

$[C o (H_{2} O)_{6}]^{2 +}$

$C o (H_{2} O)_{6}]^{3 +}$