CBSE Class 12 Chemistry Coordination Compounds Worksheet Set C

Question. The EAN value of [Ti(σ −C₃H₅)₂ (π −C₅H₅)₂]⁰ is:
a. 32
b. 33
c. 34
d. 35
Answer : C

Question. Which of the following ligands can show linkage isomerism?
a. NO
b. NH₃
c. NO⁻₃
d. None of these
Answer : A

Question. In [isothiocyanatothiocyanato (1-diphenylphosphino-3- dimethylaminopropane) palladium (II)], the Pd–NCS combination is linear while the Pd–SCN combination is bent with the ∠Pd −S−Cof 107.3°. Predict the structure adopted for SCN– group in this complex:
a. S − C ≡ N :
b. S = C = N
c. Hybrid of (A) and (B)
d. Cannot be predicted
Answer : A

Question. Choose the correct order for Δ0 for the following complexes:
A. [Co(H₂O)6]³⁺ B. [Co(H₂O)₆]^3–
C. [Fe(H₂O)₆]³⁺ D. [Fe(CN)₆]^3–
a. A < B < C < D
b. A < C < B < D
c. A < B = C < D
d. A < B < D < C
Answer : B

Question. [Fe(H₂O)₄ (CN)₂] is the empirical formula of a compound which has magnetic moment corresponding to 2²₃ unpaired electrons per iron. The best possible formula of the compound is:
a. [Fe (H₂O)₄ (CN)₂)₂ [Fe (H₂O)₄ (CN)₂]
b. [Fe (H₂O)₆] [Fe (H₂O)₂ (CN)₄]
c. [Fe (H₂O)₆]₂ [Fe (CN)₆]
d. None of these
Answer : C

Question. Which of the following statements is true for the compounds [CoF₆]^3– (I) and [NiF₆]^2– (II)?
a. Both I and II are paramagnetic
b. Both I and III are diamagnetic
c. I is paramagnetic while II is diamagnetic
d. I is paramagnetic while II is paramagnetic
Answer : C

Question. The correct order of C–C bond length in the following compounds is:
A. C₂F₄
B. C₂H₄
C. [PtCl₃ (C₂H₄]^–
a. A > B > C
b. A < B < C
c. A > C > B
d. A > B = C
Answer : B

Question. Which of the following statements is incorrect?
a. CN^– is a weaker acceptor than CO
b. The Fe–C bond length is more in [Fe(CN)₆]⁴⁻ as compared to that in [Fe (CN)₆]^3–
c. The Fe–C bond length is less in [Fe (CN)₆]^4– as compared to that in [Fe (CN)₆]^3–
d. The dFe–O {in [Fe(H₂O)₆]³⁺} < d_Fe–O {in [Fe (H₂O)₆]²⁺}
Answer : B

Question. TheV–Cdistances inV(CO)₆ and [V(CO₆)]–are respectively: (in pm).
a. 200, 200
b. 193, 200
c. 200, 193
d. 193, 193
Answer : C

Assertion and Reason

Note: Read the Assertion (A) and Reason (R) carefully to mark the correct option out of the options given below:
a. If both assertion and reason are true and the reason is the correct explanation of the assertion.
b. If both assertion and reason are true but reason is not the correct explanation of the assertion.
c. If assertion is true but reason is false.
d. If the assertion and reason both are false.
e. If assertion is false but reason is true.

Question. Assertion: All the octahedral complexes of Ni²⁺ must be outer orbital complexes.
Reason: Outer orbital octahedral complexes are given by weak ligands.
Answer : B

Question. Assertion: Potassium ferrocyanide is diamagnetic whereas potassium fericyanide is paramagnetic.
Reason: Crystal field splitting in ferrocyanide ion is greater than that of ferricyanide ion.
Answer : C

Question. 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.
Answer : B

Question. Assertion: H₂N – NH₂ is a chelating ligand.
Reason: A chelating ligand must possess two or more lone pairs at such a distance that it may form suitable strain free rings at the metal ion.
Answer : E

Question. Assertion: [Ti(H₂O)₆]³⁺ is coloured while [Sc(H₂O)₆]³⁺ is colourless.
Reason: d-d transition is not possible in [Sc(H₂O₆)³⁺ ] .
Answer : A

Question. Assertion: Potassium ferrocyanide and potassium ferricyanite both are diamagnetic.
Reason: Both have unpaired electrons.
Answer : D

Question. Assertion: NF₃ is a weaker ligand than N(CH₃)₃
Reason: NF₃ ionizes to give F– ions in aqueous solution.
Answer : C

Question. Assertion: The [Ni(en) ]Cl (en = ethylene diamine) has lower stability than [Ni(NH₃)₅ ]Cl₂
Reason: In [Ni(en)₃ ]Cl₂ the geometry of Ni is trigonal bipyramidal
Answer : D

Comprehension Based

Paragraph –I

A sequence of reaction has been represented in the given chart. A hydrated salt [A] is heated strongly.

A. F is an oxidizing agent which gives colloidal sulphur with H₂S gas and it also gives reddish brown gas with NaCl and H₂SO₄
B. C gives temporary bleaching action with moisture
C. G is a white ppt. and H is a green colour substance

Question. The number of hydrated water molecules in [A] is:
a. 7
b. 10
c. 5
d. 2
Answer : A

Question. The nature of compound C is:
a. oxidant
b. reductant
c. oxidant and reductant
d. solvent
Answer : C

Question. Aqueous solution of [A] does not acts as reducing agent for:
a. AuCl₃
b. HgCl₂
c. KMnO₄
d. NO
Answer : D

Question. Prussi\an blue compound has molecular formula:
a. K₃Fe[Fe(CN) ]
b.Fe⁴ [Fe(CN) ]
c. KF_e[Fe(CN) ]
b and c both
Answer : B

Question. Bleaching action of compound C is because of liberation of:
a. nascent H
b. nascent O
c. nascent Cl
d. O₃
Answer : A

Question. Compound F is:
a. HNO₃
b. K₂Cr₂O₇
c. KMnO₄
d. H₂SO₄
Answer : B

Question. Aqueous solution of compound [A] is slightly acidic due to:
a. hydrolysis of SO42−
b. reducing nature
c. hydrolysis of Fe2+ ion
d. oxidizing nature
Answer : C

Question. Compound K₄ [Fe(CN₆] is formed when excess KCN reacts with:
a. D
b. A
c. E
d. G + H
Answer : B

Question. When gas ‘C’ is heated with K metal, it gives?
a. K₂ SO₃
b. K₂ CO₃
c. K₂ SO₄
d. K₂ SO₄ + K₂S₂O₃
Answer : D

Question. Compound I gives brown ppt. with NH₄OH, which dissolves in:
a. dil. HCl
b. dil. NaOH
c. Cl₂ gas
d. CO gas
Answer : A

Paragraph –II

Double salts are the compounds which retain their identity in solid stae but lose their identity in solution state whereas, coordination compounds are the complex salts which retain their identity in solid state as well as in solution state. In a coordination compound the number of ions or molecules (ligend) attached to the central metal atom or ion (central atom) is beyond the number possible, on the basis of electrovalent or covalent bonding. The extra groups or ions linked to the metal by coordination bonds in which the linked group (L) is the donor and the metal (M) is the acceptor i.e., M←L. Coordination compounds are mainly of two types: (i) Neutral compound like [Fe(CO)₅]; (ii) Ionic compound, which consists of ions in which atleast one is a complex ion, e.g., cationic complex [Ag(NH₃)₂]Cl or anionic complex Na[BH₄].
Complex ion: A complex ion is an electrically charged radical which consists of a metal atom or ion surrounded by a group of ions or neutral molecules. For example [Cu(NH₃)₄]⁴⁺ [Fe(CN)₆]³⁻
Ligand: Ligands are defined as molecules or ions having atleast one pair of electrons for donation. Ligands are also known as Lewis bases. There are two main classes of ligands:

A. Classical or simple donor ligands: These are the ligands which act as electron pair donor to acceptor ions or molecules and form complexes with all types of Lewis acids, metal ions or molecules.

B. Non-classified ligands, π-bonding or π-acid ligands:
These refer to these ligands which form compound largely with transition metal atoms. This type of interaction is possible due to special properties of both metal and ligand. The metal has dorbitals that can be used in bonding and the ligand has not only donor capacity but also has acceptor orbitals. Ligand can be negative ions, positive ions or neutral molecules.

Coordination Number: The total number of ligands attached to the central metal atom in coordination sphere is called coordination number. The species outside the coordination number are ionizable species.

Question. How many ions are produced by [Co(NH₃)₆]Cl₃ ion solution?
a. 6
b. 4
c. 3
d. 2
Answer : B

Question. Which of the following is non-ionizable?
a. [Co(NH₃)₃ Cl₃]
b. [Co(NH₃) Cl₂]Cl
c. [Co(NH₃)₅ Cl]Cl₂
d. [Co(NH₃)₆] Cl₂
Answer : A

Question. The complex CoCl₃·3NH₃ ionizes to give:
a. 2Cl^–ions
b. 1Cl^–ion
c. 3Cl^–ions
d. zero Cl^–ion
Answer : D

Question. AgCl dissolves in NH₄OH due to the formation of:
a. [Ag(NH₄)₂ Cl]
b. [Ag(NH₄)₃] Cl
c. [Ag(NH₃)₂ ] Cl
d. [Ag(NH₃)₂ OH]
Answer : C

Question. Which is not π -bonded complex?
a. Zeise’s salt
b. Ferrocence
c. Dibenzene chromium
d. Tetraethyl lead
Answer : D

Question. The correct IUPAC name for K₃ [Fe(C₂O₄)₃] is
a. potassium trioxalatoferrate (II)
b. potassium trioxalatoferrate (I)
c. potassium trioxalatoferric (III)
d. potassium trioxalatoferrate (III)
Answer : D

Question. The oxidation number, coordination number and effective atomic number respectively of central metal atom in K₂[HgI₄] is:
a. 0, 2, 86
b. +2, 4, 86
c. +2, 2, 84
d. +2, 2, 86
Answer : B

Question. Maximum coordination number of a central atom can be:
a. 2
b. 4
c. 6
d. > 6
Answer : D

Question. The numerical value of ‘X’ in H_x Cr(CO)₄ is:
a. 0
b. 1
c. 2
d. 3
Answer : B

Question. Which of the following is ambidentate ligand?
a. NO₂
b. C₂O₄²⁻
c. CO
d. N₂
Answer : A

Integer

Question. The co-ordination number of copper in cuprammonium sulphate is :
Answer : 4

Question. The co-ordination number of cobalt in the complex [Co(en)₂ Br₂]Cl₂ is:
Answer : 6

Question. The primary valence of the metal ion in the co-ordination compound K₂ [Ni (CN)₄ ] is:
Answer : 3

Question. What is the EAN of nickel in Ni(CO)₄ ?
Answer : 36

Question. The oxidation number of Cr in [Cr(NH₃)₆]Cl₃ is:
Answer : 3

Please click on below link to download CBSE Class 12 Chemistry Coordination Compounds Worksheet Set C