Among the following complexes the one which shows zero crystal field stabilization energy (CFSE) is [2014]

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Q.
Among the following complexes the one which shows zero crystal field stabilization energy (CFSE) is [2014]

1 ${[Mn {(H_{2} O)}_{6}]}^{3 +}$

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

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

4 ${[Co {(H_{2} O)}_{6}]}^{3 +}$

Ans.
(2)

$H_{2} O$ is a weak field ligand, hence $Δ_{o}$ < pairing energy.

CFSE $= (- 0.4 x + 0.6 y) Δ_{o}$

where, $x$ and $y$ are no. of electrons occupying $t_{2 g}$ and $e_{g}$ orbitals respectively.

For ${[Fe {(H_{2} O)}_{6}]}^{3 +}$ complex ion,

${Fe}^{3 +} (3 d^{5}) = t_{2 g}^{3} e_{g}^{2} = - 0.4 \times 3 + 0.6 \times 2 = 0.0$ or $0 ∆_{0}$

Solution

Q.
Among the following complexes the one which shows zero crystal field stabilization energy (CFSE) is [2014]

1 ${[Mn {(H_{2} O)}_{6}]}^{3 +}$

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

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

4 ${[Co {(H_{2} O)}_{6}]}^{3 +}$

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Solution

Q. Among the following complexes the one which shows zero crystal field stabilization energy (CFSE) is [2014]

1 [Mn(H2O)6]3+

2 [Fe(H2O)6]3+

3 [Co(H2O)6]2+

4 [Co(H2O)6]3+

Ans. (2) H2O is a weak field ligand, hence Δo < pairing energy. CFSE =(-0.4x+0.6y)Δo where, x and y are no. of electrons occupying t2g and eg orbitals respectively. For [Fe(H2O)6]3+ complex ion, Fe3+ (3d5)=t2g3eg2=-0.4×3+0.6×2=0.0 or 0∆0

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Q.
Among the following complexes the one which shows zero crystal field stabilization energy (CFSE) is [2014]

1 ${[Mn {(H_{2} O)}_{6}]}^{3 +}$

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

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

4 ${[Co {(H_{2} O)}_{6}]}^{3 +}$