QBManager

COORDINATION COMPOUNDS

274371 The correct order for wavelengths of absorption in the visible region for the following complexes will be

1

{[Ni {({NH}_{3})}_{6}]}^{2 +} < {[Ni {(H_{2} O)}_{6}]}^{2 +} < {[Ni {({NO}_{2})}_{6}]}^{4 -}

2

{[Ni {({NO}_{2})}_{6}]}^{4 -} < {[Ni {({NH}_{3})}_{6}]}^{2 +} < {[Ni {(H_{2} O)}_{6}]}^{2 +}

3

{[Ni {({NH}_{3})}_{6}]}^{2 +} < {[Ni {({NO}_{2})}_{6}]}^{4 -} < {[Ni {(H_{2} O)}_{6}]}^{2 +}

4

{[Ni {({NO}_{2})}_{6}]}^{4 -} < {[Ni {(H_{2} O)}_{6}]}^{2 +} < {[Ni {({NH}_{3})}_{6}]}^{2 +}

Explanation:

(B) : Complexes, (I) ${[Ni {({NH}_{3})}_{6}]}^{2 +},$ (II) ${[Ni {(H_{2} O)}_{6}]}^{2 +}$ and ligands $- {NH}_{3}, - H_{2} O$ and $- {NO}_{2}^{-}$ respectively. The field strength order of the ligands is
$H_{2} O < {NH}_{3} < {NO}_{2}^{-}$
So, the order CFSE values : $△_{0}$ II $< △_{0}$ I $< △_{0}$ III
We know, $E = \frac{hc}{λ}$ or $E \propto \frac{1}{λ}$
So, the order of wavelength of absorption in visible region will be
${[Ni {(H_{2} O)}_{6}]}^{2 +} > {[Ni {({NH}_{3})}_{6}]}^{2 +} > {[Ni {({NO}_{2})}_{6}]}^{4 -}$

AP EAMCET (Engg.) 17.09.2020 Shift-I

COORDINATION COMPOUNDS

274372 For the ions ${Zn}^{2 +}, {Ni}^{2 +}$ and ${Cr}^{3 +}$ which among the following statement is correct?
(Atomic number of $Zn = 30, Ni = 28$ and $Cr =$ 24)

1 All these are colourless

2 All these are coloured

3 Only

{Ni}^{2 +}

is coloured and

{Zn}^{2 +}

and

{Cr}^{3 +}

are colourless

4 Only

{Zn}^{2 +}

is colourless and

{Ni}^{2 +}

and

{Cr}^{3 +}

are coloured

Explanation:

(D) : Electronic configuration of
${Zn}^{2 +} [Ar] 3 d^{10} 4 s^{0}, {Ni}^{2 +} [Ar] 3 d^{8}, 4 s^{0}$
${Cr}^{3} + [Ar] 3 d^{3}, 4 s^{0}$
${Zn}^{2 +}$ colourless (no unpaired electron)
${Ni}^{2 +}$ and ${Cr}^{3 +}$ coloured due to unpaired electrons. There is d-d transition of electron, so the solution of ions will be coloured.

AIIMS 26 May 2019 (Morning)

COORDINATION COMPOUNDS

274377 Assertion:
${[Co {({NH}_{3})}_{6}]}^{3 +} \to {[Co {({NH}_{3})}_{5} H_{2} O]}^{3 +}$
color continuously changes.
Reason: Larger wavelength will be absorbed.

1 If both Assertion and Reason are correct and the Reason is the correct explanation of Assertion.

2 If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.

3 If Assertion is correct but Reason is incorrect.

4 If both the Assertion and Reason are incorrect.

Explanation:

(A) : $H_{2} O$ is a weaker ligand than ${NH}_{3}$ . So, larger wavelength will be absorbed.

AIIMS-27 May

COORDINATION COMPOUNDS

274378 Assertion : ${[Cr {(H_{2} O)}_{6}]}^{2 +} {[Cr {(H_{2} O)}_{6}]}^{3 +}$ while converting, color continuously changes.
Reason: CFSE increases during change.

1 If both Assertion and Reason are correct and the Reason is the correct explanation of Assertion.

2 If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.

3 If Assertion is correct but Reason is incorrect.

4 If both the Assertion and Reason are incorrect.

Explanation:

(A)
$∵ {Cr}^{2 +} = [Ar] 3 d^{4} ∵ {Cr}^{3 +} = [Ar] 3 d^{3}$
original image
$CFSE = [- 0.4 \times 3 + 0.6 \times 1] Δ_{o}$
$CFSE = [- 1.2] Δ_{o}$
$CFSE = [- 1.2 + 0.6] Δ_{o}$
$CFSE = - 1.2 Δ_{o}$
$CFSE = - 0.6 Δ_{o}$
Hence, CFSE increases during the changing from ${[Cr {(H_{2} O)}_{6}]}^{2 +}$ to ${[Cr {(H_{2} O)}_{6}]}^{3 +}$ .

AIIMS-26 May

COORDINATION COMPOUNDS

274371 The correct order for wavelengths of absorption in the visible region for the following complexes will be

1

{[Ni {({NH}_{3})}_{6}]}^{2 +} < {[Ni {(H_{2} O)}_{6}]}^{2 +} < {[Ni {({NO}_{2})}_{6}]}^{4 -}

2

{[Ni {({NO}_{2})}_{6}]}^{4 -} < {[Ni {({NH}_{3})}_{6}]}^{2 +} < {[Ni {(H_{2} O)}_{6}]}^{2 +}

3

{[Ni {({NH}_{3})}_{6}]}^{2 +} < {[Ni {({NO}_{2})}_{6}]}^{4 -} < {[Ni {(H_{2} O)}_{6}]}^{2 +}

4

{[Ni {({NO}_{2})}_{6}]}^{4 -} < {[Ni {(H_{2} O)}_{6}]}^{2 +} < {[Ni {({NH}_{3})}_{6}]}^{2 +}

Explanation:

(B) : Complexes, (I) ${[Ni {({NH}_{3})}_{6}]}^{2 +},$ (II) ${[Ni {(H_{2} O)}_{6}]}^{2 +}$ and ligands $- {NH}_{3}, - H_{2} O$ and $- {NO}_{2}^{-}$ respectively. The field strength order of the ligands is
$H_{2} O < {NH}_{3} < {NO}_{2}^{-}$
So, the order CFSE values : $△_{0}$ II $< △_{0}$ I $< △_{0}$ III
We know, $E = \frac{hc}{λ}$ or $E \propto \frac{1}{λ}$
So, the order of wavelength of absorption in visible region will be
${[Ni {(H_{2} O)}_{6}]}^{2 +} > {[Ni {({NH}_{3})}_{6}]}^{2 +} > {[Ni {({NO}_{2})}_{6}]}^{4 -}$

AP EAMCET (Engg.) 17.09.2020 Shift-I

COORDINATION COMPOUNDS

274372 For the ions ${Zn}^{2 +}, {Ni}^{2 +}$ and ${Cr}^{3 +}$ which among the following statement is correct?
(Atomic number of $Zn = 30, Ni = 28$ and $Cr =$ 24)

1 All these are colourless

2 All these are coloured

3 Only

{Ni}^{2 +}

is coloured and

{Zn}^{2 +}

and

{Cr}^{3 +}

are colourless

4 Only

{Zn}^{2 +}

is colourless and

{Ni}^{2 +}

and

{Cr}^{3 +}

are coloured

Explanation:

(D) : Electronic configuration of
${Zn}^{2 +} [Ar] 3 d^{10} 4 s^{0}, {Ni}^{2 +} [Ar] 3 d^{8}, 4 s^{0}$
${Cr}^{3} + [Ar] 3 d^{3}, 4 s^{0}$
${Zn}^{2 +}$ colourless (no unpaired electron)
${Ni}^{2 +}$ and ${Cr}^{3 +}$ coloured due to unpaired electrons. There is d-d transition of electron, so the solution of ions will be coloured.

AIIMS 26 May 2019 (Morning)

COORDINATION COMPOUNDS

274377 Assertion:
${[Co {({NH}_{3})}_{6}]}^{3 +} \to {[Co {({NH}_{3})}_{5} H_{2} O]}^{3 +}$
color continuously changes.
Reason: Larger wavelength will be absorbed.

1 If both Assertion and Reason are correct and the Reason is the correct explanation of Assertion.

2 If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.

3 If Assertion is correct but Reason is incorrect.

4 If both the Assertion and Reason are incorrect.

Explanation:

(A) : $H_{2} O$ is a weaker ligand than ${NH}_{3}$ . So, larger wavelength will be absorbed.

AIIMS-27 May

COORDINATION COMPOUNDS

274378 Assertion : ${[Cr {(H_{2} O)}_{6}]}^{2 +} {[Cr {(H_{2} O)}_{6}]}^{3 +}$ while converting, color continuously changes.
Reason: CFSE increases during change.

1 If both Assertion and Reason are correct and the Reason is the correct explanation of Assertion.

2 If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.

3 If Assertion is correct but Reason is incorrect.

4 If both the Assertion and Reason are incorrect.

Explanation:

(A)
$∵ {Cr}^{2 +} = [Ar] 3 d^{4} ∵ {Cr}^{3 +} = [Ar] 3 d^{3}$
original image
$CFSE = [- 0.4 \times 3 + 0.6 \times 1] Δ_{o}$
$CFSE = [- 1.2] Δ_{o}$
$CFSE = [- 1.2 + 0.6] Δ_{o}$
$CFSE = - 1.2 Δ_{o}$
$CFSE = - 0.6 Δ_{o}$
Hence, CFSE increases during the changing from ${[Cr {(H_{2} O)}_{6}]}^{2 +}$ to ${[Cr {(H_{2} O)}_{6}]}^{3 +}$ .

AIIMS-26 May

COORDINATION COMPOUNDS

274371 The correct order for wavelengths of absorption in the visible region for the following complexes will be

1

{[Ni {({NH}_{3})}_{6}]}^{2 +} < {[Ni {(H_{2} O)}_{6}]}^{2 +} < {[Ni {({NO}_{2})}_{6}]}^{4 -}

2

{[Ni {({NO}_{2})}_{6}]}^{4 -} < {[Ni {({NH}_{3})}_{6}]}^{2 +} < {[Ni {(H_{2} O)}_{6}]}^{2 +}

3

{[Ni {({NH}_{3})}_{6}]}^{2 +} < {[Ni {({NO}_{2})}_{6}]}^{4 -} < {[Ni {(H_{2} O)}_{6}]}^{2 +}

4

{[Ni {({NO}_{2})}_{6}]}^{4 -} < {[Ni {(H_{2} O)}_{6}]}^{2 +} < {[Ni {({NH}_{3})}_{6}]}^{2 +}

Explanation:

(B) : Complexes, (I) ${[Ni {({NH}_{3})}_{6}]}^{2 +},$ (II) ${[Ni {(H_{2} O)}_{6}]}^{2 +}$ and ligands $- {NH}_{3}, - H_{2} O$ and $- {NO}_{2}^{-}$ respectively. The field strength order of the ligands is
$H_{2} O < {NH}_{3} < {NO}_{2}^{-}$
So, the order CFSE values : $△_{0}$ II $< △_{0}$ I $< △_{0}$ III
We know, $E = \frac{hc}{λ}$ or $E \propto \frac{1}{λ}$
So, the order of wavelength of absorption in visible region will be
${[Ni {(H_{2} O)}_{6}]}^{2 +} > {[Ni {({NH}_{3})}_{6}]}^{2 +} > {[Ni {({NO}_{2})}_{6}]}^{4 -}$

AP EAMCET (Engg.) 17.09.2020 Shift-I

COORDINATION COMPOUNDS

274372 For the ions ${Zn}^{2 +}, {Ni}^{2 +}$ and ${Cr}^{3 +}$ which among the following statement is correct?
(Atomic number of $Zn = 30, Ni = 28$ and $Cr =$ 24)

1 All these are colourless

2 All these are coloured

3 Only

{Ni}^{2 +}

is coloured and

{Zn}^{2 +}

and

{Cr}^{3 +}

are colourless

4 Only

{Zn}^{2 +}

is colourless and

{Ni}^{2 +}

and

{Cr}^{3 +}

are coloured

Explanation:

(D) : Electronic configuration of
${Zn}^{2 +} [Ar] 3 d^{10} 4 s^{0}, {Ni}^{2 +} [Ar] 3 d^{8}, 4 s^{0}$
${Cr}^{3} + [Ar] 3 d^{3}, 4 s^{0}$
${Zn}^{2 +}$ colourless (no unpaired electron)
${Ni}^{2 +}$ and ${Cr}^{3 +}$ coloured due to unpaired electrons. There is d-d transition of electron, so the solution of ions will be coloured.

AIIMS 26 May 2019 (Morning)

COORDINATION COMPOUNDS

274377 Assertion:
${[Co {({NH}_{3})}_{6}]}^{3 +} \to {[Co {({NH}_{3})}_{5} H_{2} O]}^{3 +}$
color continuously changes.
Reason: Larger wavelength will be absorbed.

1 If both Assertion and Reason are correct and the Reason is the correct explanation of Assertion.

2 If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.

3 If Assertion is correct but Reason is incorrect.

4 If both the Assertion and Reason are incorrect.

Explanation:

(A) : $H_{2} O$ is a weaker ligand than ${NH}_{3}$ . So, larger wavelength will be absorbed.

AIIMS-27 May

COORDINATION COMPOUNDS

274378 Assertion : ${[Cr {(H_{2} O)}_{6}]}^{2 +} {[Cr {(H_{2} O)}_{6}]}^{3 +}$ while converting, color continuously changes.
Reason: CFSE increases during change.

1 If both Assertion and Reason are correct and the Reason is the correct explanation of Assertion.

2 If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.

3 If Assertion is correct but Reason is incorrect.

4 If both the Assertion and Reason are incorrect.

Explanation:

(A)
$∵ {Cr}^{2 +} = [Ar] 3 d^{4} ∵ {Cr}^{3 +} = [Ar] 3 d^{3}$
original image
$CFSE = [- 0.4 \times 3 + 0.6 \times 1] Δ_{o}$
$CFSE = [- 1.2] Δ_{o}$
$CFSE = [- 1.2 + 0.6] Δ_{o}$
$CFSE = - 1.2 Δ_{o}$
$CFSE = - 0.6 Δ_{o}$
Hence, CFSE increases during the changing from ${[Cr {(H_{2} O)}_{6}]}^{2 +}$ to ${[Cr {(H_{2} O)}_{6}]}^{3 +}$ .

AIIMS-26 May

COORDINATION COMPOUNDS

274371 The correct order for wavelengths of absorption in the visible region for the following complexes will be

1

{[Ni {({NH}_{3})}_{6}]}^{2 +} < {[Ni {(H_{2} O)}_{6}]}^{2 +} < {[Ni {({NO}_{2})}_{6}]}^{4 -}

2

{[Ni {({NO}_{2})}_{6}]}^{4 -} < {[Ni {({NH}_{3})}_{6}]}^{2 +} < {[Ni {(H_{2} O)}_{6}]}^{2 +}

3

{[Ni {({NH}_{3})}_{6}]}^{2 +} < {[Ni {({NO}_{2})}_{6}]}^{4 -} < {[Ni {(H_{2} O)}_{6}]}^{2 +}

4

{[Ni {({NO}_{2})}_{6}]}^{4 -} < {[Ni {(H_{2} O)}_{6}]}^{2 +} < {[Ni {({NH}_{3})}_{6}]}^{2 +}

Explanation:

(B) : Complexes, (I) ${[Ni {({NH}_{3})}_{6}]}^{2 +},$ (II) ${[Ni {(H_{2} O)}_{6}]}^{2 +}$ and ligands $- {NH}_{3}, - H_{2} O$ and $- {NO}_{2}^{-}$ respectively. The field strength order of the ligands is
$H_{2} O < {NH}_{3} < {NO}_{2}^{-}$
So, the order CFSE values : $△_{0}$ II $< △_{0}$ I $< △_{0}$ III
We know, $E = \frac{hc}{λ}$ or $E \propto \frac{1}{λ}$
So, the order of wavelength of absorption in visible region will be
${[Ni {(H_{2} O)}_{6}]}^{2 +} > {[Ni {({NH}_{3})}_{6}]}^{2 +} > {[Ni {({NO}_{2})}_{6}]}^{4 -}$

AP EAMCET (Engg.) 17.09.2020 Shift-I

COORDINATION COMPOUNDS

274372 For the ions ${Zn}^{2 +}, {Ni}^{2 +}$ and ${Cr}^{3 +}$ which among the following statement is correct?
(Atomic number of $Zn = 30, Ni = 28$ and $Cr =$ 24)

1 All these are colourless

2 All these are coloured

3 Only

{Ni}^{2 +}

is coloured and

{Zn}^{2 +}

and

{Cr}^{3 +}

are colourless

4 Only

{Zn}^{2 +}

is colourless and

{Ni}^{2 +}

and

{Cr}^{3 +}

are coloured

Explanation:

(D) : Electronic configuration of
${Zn}^{2 +} [Ar] 3 d^{10} 4 s^{0}, {Ni}^{2 +} [Ar] 3 d^{8}, 4 s^{0}$
${Cr}^{3} + [Ar] 3 d^{3}, 4 s^{0}$
${Zn}^{2 +}$ colourless (no unpaired electron)
${Ni}^{2 +}$ and ${Cr}^{3 +}$ coloured due to unpaired electrons. There is d-d transition of electron, so the solution of ions will be coloured.

AIIMS 26 May 2019 (Morning)

COORDINATION COMPOUNDS

274377 Assertion:
${[Co {({NH}_{3})}_{6}]}^{3 +} \to {[Co {({NH}_{3})}_{5} H_{2} O]}^{3 +}$
color continuously changes.
Reason: Larger wavelength will be absorbed.

1 If both Assertion and Reason are correct and the Reason is the correct explanation of Assertion.

2 If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.

3 If Assertion is correct but Reason is incorrect.

4 If both the Assertion and Reason are incorrect.

Explanation:

(A) : $H_{2} O$ is a weaker ligand than ${NH}_{3}$ . So, larger wavelength will be absorbed.

AIIMS-27 May

COORDINATION COMPOUNDS

274378 Assertion : ${[Cr {(H_{2} O)}_{6}]}^{2 +} {[Cr {(H_{2} O)}_{6}]}^{3 +}$ while converting, color continuously changes.
Reason: CFSE increases during change.

1 If both Assertion and Reason are correct and the Reason is the correct explanation of Assertion.

2 If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.

3 If Assertion is correct but Reason is incorrect.

4 If both the Assertion and Reason are incorrect.

Explanation:

(A)
$∵ {Cr}^{2 +} = [Ar] 3 d^{4} ∵ {Cr}^{3 +} = [Ar] 3 d^{3}$
original image
$CFSE = [- 0.4 \times 3 + 0.6 \times 1] Δ_{o}$
$CFSE = [- 1.2] Δ_{o}$
$CFSE = [- 1.2 + 0.6] Δ_{o}$
$CFSE = - 1.2 Δ_{o}$
$CFSE = - 0.6 Δ_{o}$
Hence, CFSE increases during the changing from ${[Cr {(H_{2} O)}_{6}]}^{2 +}$ to ${[Cr {(H_{2} O)}_{6}]}^{3 +}$ .

AIIMS-26 May

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