Coordination Compounds Test

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Coordination Compounds Test - 26

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Question 1
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Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion (A): Toxic metal ions are removed by the chelating ligands.
Reason (R): Chelate complexes tend to be more stable.

A
A. Both A and R are true and R is the correct explanation of A

B
B. Both A and R are true but R is NOT the correct explanation of A

C
C. A is true but R is false

D
D. A is false and R is true

Solution

When a solution of chelating ligand is added to solution containing toxic metal ligands chelates the metal ions by formation of stable complex.
Question 2
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Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion: A mong [CO(NH₃)₆]³⁺ and [CO(en)₃]3+, coordination compound [CO(en)₃]³⁺ is a more stable complex.
Reason: Because (en) is a chelating ligand/bidentate ligand.

A
A. Both A and R are true and R is the correct explanation of A

B
B. Both A and R are true but R is NOT the correct explanation of A

C
C. A is true but R is false

D
D. A is false and R is true

Solution

Since (ethylene diamine-en) is a chelating ligand/bidentate ligand, [CO(en₃)]³⁺ is a more stable complex as compared to the other one.
Question 3
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Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion (A): [Cr(H₂O)₆]Cl₂ and [Fe(H₂O)₆]Cl₂ are reducing in nature.
Reason (R): Unpaired electrons are present in their d-orbitals.

A
A. Both A and R are true and R is the correct explanation of A

B
B. Both A and R are true but R is NOT the correct explanation of A

C
C. A is true but R is false

D
D. A is false and R is true

Solution

In the complexes, Co exists as Co²⁺ and Fe as Fe²⁺. Both of the complexes become Stable by oxidation of metal ion to Co³⁺ and Fe³⁺.
Question 4
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Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion (A): Low spin tetrahedral complexes are rarely observed.
Reason (R): Crystal field splitting is less than pairing energy for tetrahedral complexes.

A
A. Both A and R are true and R is the correct explanation of A

B
B. Both A and R are true but R is NOT the correct explanation of A

C
C. A is true but R is false

D
D. A is false and R is true

Solution

In tetrahedral complexes, the splitting of the d-orbitals is inverted and is smaller in comparison to octahedral complexes. The Crystal field splitting energy is not large enough to force pairing and hence, low spin complexes are rarely observed.
Question 5
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Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion (A): Linkage isomerism arises in coordination compounds containing ambidentate ligand.
Reason (R): Ambidentate ligand has two different donor atoms.

A
A. Both A and R are true and R is the correct explanation of A

B
B. Both A and R are true but R is NOT the correct explanation of A

C
C. A is true but R is false

D
D. A is false and R is true

Solution

Linkage isomerism arises due to two different donor atoms in ambidentate ligand.
Question 6
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Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion (A): [Fe(CN)₆]³⁻ ion shows magnetic moment corresponding to two unpaired electrons.
Reason (R): Because it has d²sp³ type hybridisation.

A
Both A and R are true and R is the correct explanation of A

B
Both A and R are true but R is NOT the correct explanation of A

C
A is true but R is false

D
A is false and R is true

Solution

[Fe(CN)₆]³⁻ ion shows magnetic moment corresponding to two unpaired electrons.
Question 7
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Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion (A): Complexes of MX₆ and MX₅L type (X and L are unidentate) do not show geometrical isomerism.
Reason (R): Geometrical isomerism is not shown by complexes of coordination number 6.

A
A. Both A and R are true and R is the correct explanation of A

B
B. Both A and R are true but R is NOT the correct explanation of A

C
C. A is true but R is false

D
D. A is false and R is true

Solution

For complexes of MX₆ and MX₅L type, different geometric arrangements of the ligands are not possible due to presence of plane of symmetry.
Question 8
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Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.
Assertion : NF₃ is a weaker ligand than N(CH₃)₃.
Reason : NF₃ ionizes to give F^– ions in aqueous solution.

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

B
B. If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.

C
C. If the Assertion is correct but Reason is incorrect.

D
D. If both the Assertion and Reason are incorrect.

Solution

It is a correct statement that NF₃ is a weaker ligand than N(CH₃)₃, the reason is that fluorine is highly electronegative therefore, it withdraws electrons from the nitrogen atom. Hence, the lone pair of nitrogen atoms cannot be ligated. While N(CH₃)₃ is a strong ligand because CH₃ has an electron releasing group.
Question 9
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Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.
Assertion : [Ti(H₂O)₆]³⁺ is coloured while [Sc(H₂O)₆]³⁺ is colourless.
Reason : d-d transition is not possible in [Sc(H₂O)₆]³⁺.

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

B
B. If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.

C
C. If the Assertion is correct but Reason is incorrect.

D
D. If both the Assertion and Reason are incorrect.

Solution

Ti has the electronic configuration [Ar] 3d². In [Ti(H₂O)₆]³⁺ complex it is present as Ti³⁺ which has one unpaired electron in 3d orbital.Thus d-d transition is possible only in Ti(H₂O)₆³⁺ and thereby it shows colour And also it undergoes d²sp³ (octahedral) hybridization to accomodate 6 pairs of water.
So the complex is octahedral in shape, will be coloured and paramagnetic due to presence of one unpaired electron.
Sc has the electronic configuration [Ar]3d1 . Since it is present in the complex [Sc(H2O)6]3+ as Sc3+ it has no unpaired electron. It will also undergo d2sp3 hybridization to accomodate 6 pairs of electrons from water.
So it is also octahedral, colourless and diamagnetic due to absence of unpaired electron.
Question 10
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Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.
Assertion : [Fe(CN)₆]^3– is weakly paramagnetic while [Fe(CN)₆]^4– is diamagnetic.
Reason : [Fe(CN)₆]^3–has +3 oxidation state while [Fe(CN)₆]^4– has +2 oxidation state.

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

B
B. If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.

C
C. If the Assertion is correct but Reason is incorrect.

D
D. If both the Assertion and Reason are incorrect.

Solution

Paramagnetic Character depends on the number of unpaired electrons. In the [Fe(CN)₆]^3– has 1 unpaired electron, therefore, it is paramagnetic whereas [Fe(CN)₆]^3– is diamagnetic because it does not have unpaired electrons.

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Coordination Compounds Test - 26

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Coordination Compounds Test - 26

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Question 1

A. Both A and R are true and R is the correct explanation of A

B. Both A and R are true but R is NOT the correct explanation of A

C. A is true but R is false

D. A is false and R is true

Solution

Question 2

A. Both A and R are true and R is the correct explanation of A

B. Both A and R are true but R is NOT the correct explanation of A

C. A is true but R is false

D. A is false and R is true

Solution

Question 3

A. Both A and R are true and R is the correct explanation of A

B. Both A and R are true but R is NOT the correct explanation of A

C. A is true but R is false

D. A is false and R is true

Solution

Question 4

A. Both A and R are true and R is the correct explanation of A

B. Both A and R are true but R is NOT the correct explanation of A

C. A is true but R is false

D. A is false and R is true

Solution

Question 5

A. Both A and R are true and R is the correct explanation of A

B. Both A and R are true but R is NOT the correct explanation of A

C. A is true but R is false

D. A is false and R is true

Solution

Question 6

Both A and R are true and R is the correct explanation of A

Both A and R are true but R is NOT the correct explanation of A

A is true but R is false

A is false and R is true

Solution

Question 7

A. Both A and R are true and R is the correct explanation of A

B. Both A and R are true but R is NOT the correct explanation of A

C. A is true but R is false

D. A is false and R is true

Solution

Question 8

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

B. If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.

C. If the Assertion is correct but Reason is incorrect.

D. If both the Assertion and Reason are incorrect.

Solution

Question 9

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

B. If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.

C. If the Assertion is correct but Reason is incorrect.

D. If both the Assertion and Reason are incorrect.

Solution

Question 10

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

B. If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.

C. If the Assertion is correct but Reason is incorrect.

D. If both the Assertion and Reason are incorrect.

Solution

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