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CHXII09:COORDINATION COMPOUNDS

321821 $[Cr {(H_{2} O)}_{6}] {Cl}_{3}$ (at. no. of $Cr = 24$ ) has a magnetic moment of 3.83 B.M. The correct distribution of $3 d$ -electrons in the Chromium of the complex is

1

3 d_{x y}^{1}, 3 d_{y z}^{1}, 3 d_{x z}^{1}

2

3 d_{x y}^{1}, 3 d_{y z}^{1}, 3 d_{z^{2}}^{1}

3

(3 d_{x^{2} - y^{2}}^{1}), 3 d_{z^{2}}^{1}, 3 d_{x z}^{1}

4

3 d_{x y}^{1}, (3 d_{x^{2} - y^{2}}^{1}), 3 d_{y z}^{1}

Explanation:

$C r^{3 +} : 1 s^{2}, 2 s^{2} 2 p^{6}, 3 s^{2} 3 p^{6} 3 d^{3}$
The ${3d}_{xy}^{1} {,3d}_{xz}^{1} and {3d}_{yz}^{1}$ has lower energy.

CHXII09:COORDINATION COMPOUNDS

321822 Among the following complexes, the one which shows zero crystal field stabilisation energy (CFSE) is

1

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

2

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

3

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

4

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

Explanation:

$H_{2} O$ is a weak ligand
$CFSE = ( - 0 .4x + 0 .6y) Δ_{0}$
where $x$ and $y$ are electrons present in $t_{2g} and e_{g}$ orbitals.
For ${[Fe {(H_{2} O)}_{6}]}^{3 +}$ complex ion
$F e^{3 +} (3 d^{5}) {= t}_{2g}^{3} e_{g}^{2} = - 0 . 4 \times 3 + 0 .6 \times 2 = 0$

CHXII09:COORDINATION COMPOUNDS

321823 What is the correct electronic configuration of the central atom in $K_{4} [Fe (CN)_{6}]$ based on crystal field theory?

1

t_{2 g}^{4} e_{g}^{2}

2

t_{2 g}^{6} e_{g}^{0}

3

e^{3} t_{2}^{3}

4

e^{4} t_{2}^{2}

Explanation:

$K_{4} [Fe(CN)_{6}]$
Fe ground state : $[Ar]3 d^{6} 4 s^{2}$
$F e^{2 +} :3 d^{6} 4 s^{0}$

NEET - 2019

CHXII09:COORDINATION COMPOUNDS

321824 In which of the following octahedral complexes of Co (at. no. 27), will the magnitude of $Δ_{0}$ be the highest?

1

{[{CoF}_{6}]}^{3 -}

2

{[Co {(C_{2} O_{4})}_{3}]}^{3 -}

3

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

4

{[Co {({NH}_{3})}_{6}]}^{3 +}

Explanation:

${NH}_{3}$ is stronger ligand. Hence $Δ_{o}$ is highest.

CHXII09:COORDINATION COMPOUNDS

321821 $[Cr {(H_{2} O)}_{6}] {Cl}_{3}$ (at. no. of $Cr = 24$ ) has a magnetic moment of 3.83 B.M. The correct distribution of $3 d$ -electrons in the Chromium of the complex is

1

3 d_{x y}^{1}, 3 d_{y z}^{1}, 3 d_{x z}^{1}

2

3 d_{x y}^{1}, 3 d_{y z}^{1}, 3 d_{z^{2}}^{1}

3

(3 d_{x^{2} - y^{2}}^{1}), 3 d_{z^{2}}^{1}, 3 d_{x z}^{1}

4

3 d_{x y}^{1}, (3 d_{x^{2} - y^{2}}^{1}), 3 d_{y z}^{1}

Explanation:

$C r^{3 +} : 1 s^{2}, 2 s^{2} 2 p^{6}, 3 s^{2} 3 p^{6} 3 d^{3}$
The ${3d}_{xy}^{1} {,3d}_{xz}^{1} and {3d}_{yz}^{1}$ has lower energy.

CHXII09:COORDINATION COMPOUNDS

321822 Among the following complexes, the one which shows zero crystal field stabilisation energy (CFSE) is

1

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

2

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

3

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

4

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

Explanation:

$H_{2} O$ is a weak ligand
$CFSE = ( - 0 .4x + 0 .6y) Δ_{0}$
where $x$ and $y$ are electrons present in $t_{2g} and e_{g}$ orbitals.
For ${[Fe {(H_{2} O)}_{6}]}^{3 +}$ complex ion
$F e^{3 +} (3 d^{5}) {= t}_{2g}^{3} e_{g}^{2} = - 0 . 4 \times 3 + 0 .6 \times 2 = 0$

CHXII09:COORDINATION COMPOUNDS

321823 What is the correct electronic configuration of the central atom in $K_{4} [Fe (CN)_{6}]$ based on crystal field theory?

1

t_{2 g}^{4} e_{g}^{2}

2

t_{2 g}^{6} e_{g}^{0}

3

e^{3} t_{2}^{3}

4

e^{4} t_{2}^{2}

Explanation:

$K_{4} [Fe(CN)_{6}]$
Fe ground state : $[Ar]3 d^{6} 4 s^{2}$
$F e^{2 +} :3 d^{6} 4 s^{0}$

NEET - 2019

CHXII09:COORDINATION COMPOUNDS

321824 In which of the following octahedral complexes of Co (at. no. 27), will the magnitude of $Δ_{0}$ be the highest?

1

{[{CoF}_{6}]}^{3 -}

2

{[Co {(C_{2} O_{4})}_{3}]}^{3 -}

3

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

4

{[Co {({NH}_{3})}_{6}]}^{3 +}

Explanation:

${NH}_{3}$ is stronger ligand. Hence $Δ_{o}$ is highest.

CHXII09:COORDINATION COMPOUNDS

321821 $[Cr {(H_{2} O)}_{6}] {Cl}_{3}$ (at. no. of $Cr = 24$ ) has a magnetic moment of 3.83 B.M. The correct distribution of $3 d$ -electrons in the Chromium of the complex is

1

3 d_{x y}^{1}, 3 d_{y z}^{1}, 3 d_{x z}^{1}

2

3 d_{x y}^{1}, 3 d_{y z}^{1}, 3 d_{z^{2}}^{1}

3

(3 d_{x^{2} - y^{2}}^{1}), 3 d_{z^{2}}^{1}, 3 d_{x z}^{1}

4

3 d_{x y}^{1}, (3 d_{x^{2} - y^{2}}^{1}), 3 d_{y z}^{1}

Explanation:

$C r^{3 +} : 1 s^{2}, 2 s^{2} 2 p^{6}, 3 s^{2} 3 p^{6} 3 d^{3}$
The ${3d}_{xy}^{1} {,3d}_{xz}^{1} and {3d}_{yz}^{1}$ has lower energy.

CHXII09:COORDINATION COMPOUNDS

321822 Among the following complexes, the one which shows zero crystal field stabilisation energy (CFSE) is

1

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

2

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

3

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

4

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

Explanation:

$H_{2} O$ is a weak ligand
$CFSE = ( - 0 .4x + 0 .6y) Δ_{0}$
where $x$ and $y$ are electrons present in $t_{2g} and e_{g}$ orbitals.
For ${[Fe {(H_{2} O)}_{6}]}^{3 +}$ complex ion
$F e^{3 +} (3 d^{5}) {= t}_{2g}^{3} e_{g}^{2} = - 0 . 4 \times 3 + 0 .6 \times 2 = 0$

CHXII09:COORDINATION COMPOUNDS

321823 What is the correct electronic configuration of the central atom in $K_{4} [Fe (CN)_{6}]$ based on crystal field theory?

1

t_{2 g}^{4} e_{g}^{2}

2

t_{2 g}^{6} e_{g}^{0}

3

e^{3} t_{2}^{3}

4

e^{4} t_{2}^{2}

Explanation:

$K_{4} [Fe(CN)_{6}]$
Fe ground state : $[Ar]3 d^{6} 4 s^{2}$
$F e^{2 +} :3 d^{6} 4 s^{0}$

NEET - 2019

CHXII09:COORDINATION COMPOUNDS

321824 In which of the following octahedral complexes of Co (at. no. 27), will the magnitude of $Δ_{0}$ be the highest?

1

{[{CoF}_{6}]}^{3 -}

2

{[Co {(C_{2} O_{4})}_{3}]}^{3 -}

3

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

4

{[Co {({NH}_{3})}_{6}]}^{3 +}

Explanation:

${NH}_{3}$ is stronger ligand. Hence $Δ_{o}$ is highest.

CHXII09:COORDINATION COMPOUNDS

321821 $[Cr {(H_{2} O)}_{6}] {Cl}_{3}$ (at. no. of $Cr = 24$ ) has a magnetic moment of 3.83 B.M. The correct distribution of $3 d$ -electrons in the Chromium of the complex is

1

3 d_{x y}^{1}, 3 d_{y z}^{1}, 3 d_{x z}^{1}

2

3 d_{x y}^{1}, 3 d_{y z}^{1}, 3 d_{z^{2}}^{1}

3

(3 d_{x^{2} - y^{2}}^{1}), 3 d_{z^{2}}^{1}, 3 d_{x z}^{1}

4

3 d_{x y}^{1}, (3 d_{x^{2} - y^{2}}^{1}), 3 d_{y z}^{1}

Explanation:

$C r^{3 +} : 1 s^{2}, 2 s^{2} 2 p^{6}, 3 s^{2} 3 p^{6} 3 d^{3}$
The ${3d}_{xy}^{1} {,3d}_{xz}^{1} and {3d}_{yz}^{1}$ has lower energy.

CHXII09:COORDINATION COMPOUNDS

321822 Among the following complexes, the one which shows zero crystal field stabilisation energy (CFSE) is

1

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

2

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

3

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

4

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

Explanation:

$H_{2} O$ is a weak ligand
$CFSE = ( - 0 .4x + 0 .6y) Δ_{0}$
where $x$ and $y$ are electrons present in $t_{2g} and e_{g}$ orbitals.
For ${[Fe {(H_{2} O)}_{6}]}^{3 +}$ complex ion
$F e^{3 +} (3 d^{5}) {= t}_{2g}^{3} e_{g}^{2} = - 0 . 4 \times 3 + 0 .6 \times 2 = 0$

CHXII09:COORDINATION COMPOUNDS

321823 What is the correct electronic configuration of the central atom in $K_{4} [Fe (CN)_{6}]$ based on crystal field theory?

1

t_{2 g}^{4} e_{g}^{2}

2

t_{2 g}^{6} e_{g}^{0}

3

e^{3} t_{2}^{3}

4

e^{4} t_{2}^{2}

Explanation:

$K_{4} [Fe(CN)_{6}]$
Fe ground state : $[Ar]3 d^{6} 4 s^{2}$
$F e^{2 +} :3 d^{6} 4 s^{0}$

NEET - 2019

CHXII09:COORDINATION COMPOUNDS

321824 In which of the following octahedral complexes of Co (at. no. 27), will the magnitude of $Δ_{0}$ be the highest?

1

{[{CoF}_{6}]}^{3 -}

2

{[Co {(C_{2} O_{4})}_{3}]}^{3 -}

3

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

4

{[Co {({NH}_{3})}_{6}]}^{3 +}

Explanation:

${NH}_{3}$ is stronger ligand. Hence $Δ_{o}$ is highest.