Coordination Compounds Test

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Coordination Compounds Test - 1

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Weekly Quiz Competition

Question 1
1 / -0

Vitamin B₁₂ is a complex of

A
cobalt(II) ion

B
cobalt(III) ion

C
chromium(II) ion

D
chromium(III) ion
Question 2
1 / -0

A group of atoms can function as a ligand only when

A
It is a small molecule

B
It is a positively charged ion

C
It is capable of acting as donor of electron pair

D
It is a compound.

Solution

Ligands are the ions/molecules bound to the central metal atom/ion in a coordination entity. These may be simple ions like Cl-, small molecules like NH₃, large molecules like ethane-1.2-diamine or even macromolecules like proteins. A ligand must be able to donate a pair of electrons to the central metal atom/ion and thus they act as lewis bases.
Question 3
1 / -0

According to the postulates of Werner's theory, for coordination compounds,

A
primary valency is ionisable

B
secondary valency is ionisable

C
primary and secondary valencies are non-ionisable

D
primary and secondary valencies are ionisable
Question 4
1 / -0

Which of the following represents a chelate ligand?

A
H₂O

B
Cl^–

C
NH₂CH₂CH₂NH₂

D
OH^–

Solution

When a di- or polydentate ligand uses its two or more donor atoms to bind to a single metal atom/ion, it is said to be a chelate ligand. Ethane-1,2-diamine (NH₂CH₂CH₂NH₂) can act as a chelate ligand as it is a didentate ligand
Question 5
1 / -0

Which among the following is an ambidentate ligand?

A
Nitrito

B
Carbonyl

C
Acetate

D
Oxalate

Solution

Ambidentate ligands are those ligands which can ligate through two different atoms. Nitrito is an ambidentate ligand as it can coordinate to the central metal atom/ion through O in nitrito-O i.e. ONO− and through N in nitrito-N i.e. NO₂−.
Question 6
1 / -0

Ethylenediaminetetraacetate ion is a

A
bidentate ligand

B
tetradentate ligand

C
pentadentate ligand

D
hexadentate ligand
Question 7
1 / -0

Which of the following statements is not correct?

A
The complexes [NiCl₄]^2- and [Ni(CN)₄]^2- differ in the state of hybridisation of nickel.

B
The complexes [NiCl₄]^2- and [Ni(CN)₄]^2- differ in the magnetic properties.

C
The complexes [NiCl₄]^2- and [Ni(CN)₄]^2- differ in the geometries.

D
The complexes [NiCl₄]^2- and [Ni(CN)₄]^2- differ in the primary valencies of nickel.
Question 8
1 / -0

In the following question, a statement of Assertion is given; followed by a corresponding statement of Reason just below it. Mark the correct answer as:

(a)    If both assertion and reason are true and reason is the correct explanation of assertion
(b) If both assertion and reason are true, but reason is not the correct explanation of assertion
(c)    If assertion is true statement, but reason is false
(d)    If both assertion and reason are false

Assertion: [Ni(en)3Cl2]Cl2 (en = ethylene diamine) has lower stability than [Ni(NH3)6Cl2].
Reason: In [Ni(en)3Cl2], the geometry of Ni is trigonal bipyramidal.

A
(a)

B
(b)

C
(c)

D
(d)
Question 9
1 / -0

The IUPAC name of the complex [Ni(NH₃)₄] [NiCl₄] is

A
tetrachloronickel(II)-tetraamminenickel(II)

B
tetraamminenickel(II)-tetrachloronickel(II)

C
tetraamminenickel(II)-tetrachloronickelate(II)

D
tetrachloronickel(II)-tetraamminenickelate(II)

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Coordination Compounds Test - 1

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Question 1

cobalt(II) ion

cobalt(III) ion

chromium(II) ion

chromium(III) ion

Question 2

It is a small molecule

It is a positively charged ion

It is capable of acting as donor of electron pair

It is a compound.

Solution

Question 3

primary valency is ionisable

secondary valency is ionisable

primary and secondary valencies are non-ionisable

primary and secondary valencies are ionisable

Question 4

H2O

Cl–

NH2CH2CH2NH2

OH–

Solution

Question 5

Nitrito

Carbonyl

Acetate

Oxalate

Solution

Question 6

bidentate ligand

tetradentate ligand

pentadentate ligand

hexadentate ligand

Question 7

The complexes [NiCl4]2- and [Ni(CN)4]2- differ in the state of hybridisation of nickel.

The complexes [NiCl4]2- and [Ni(CN)4]2- differ in the magnetic properties.

The complexes [NiCl4]2- and [Ni(CN)4]2- differ in the geometries.

The complexes [NiCl4]2- and [Ni(CN)4]2- differ in the primary valencies of nickel.

Question 8

(a)

(b)

(c)

(d)

Question 9

tetrachloronickel(II)-tetraamminenickel(II)

tetraamminenickel(II)-tetrachloronickel(II)

tetraamminenickel(II)-tetrachloronickelate(II)

tetrachloronickel(II)-tetraamminenickelate(II)

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H₂O

Cl^–

NH₂CH₂CH₂NH₂

OH^–

The complexes [NiCl₄]^2- and [Ni(CN)₄]^2- differ in the state of hybridisation of nickel.

The complexes [NiCl₄]^2- and [Ni(CN)₄]^2- differ in the magnetic properties.

The complexes [NiCl₄]^2- and [Ni(CN)₄]^2- differ in the geometries.

The complexes [NiCl₄]^2- and [Ni(CN)₄]^2- differ in the primary valencies of nickel.