CBSE Class 12 Chemistry MCQ for Coordination Compounds

The topic of Coordination Compounds is one of the most intresting and scoring topics in Class 12 Chemistry. Many students find it little confusing at first, but once the basic concept of central metal atom and ligands are clear, solving MCQs becomes much easy. This page provide complete set of MCQs for the Coordination Compounds chapter 9 of Class 12 Chemistry designed from the latest CBSE class 12 chemistry Syllabus and NCERT Solutions for class 12 chemistry. These MCQs questions help students to understand important formula, IUPAC nomenclature, oxidation number, and geometry of complex compounds.

The Class 12 Chemistry MCQ for Coordination Compounds also includes important tricky questions for quick revision before exams. Practicing coordination compounds class 12 mcq regularly helps to improve logical thinking and problem solving speed. Each coordination compounds mcq class 12 is made as per board pattern to make student confident in Class 12 board exams and competitive tests like JEE Exam or NEET Exam. We have also included coordination chemistry mcq with answers so that learners can check their preparation instantly.

Chapter 9 Coordination Compounds Class 12 MCQs

Ques: Which of the following is a coordination compound?

a) NaCl

b) [Cu(NH₃)₄]SO₄

c) K₂SO₄

d) Na₂CO₃

Ans: b

Explanation: It contains a complex ion [Cu(NH₃)₄]²⁺ coordinated with NH₃ ligands.

Ques: In [Co(NH₃)₆]Cl₃, the coordination number of Co is:

a) 3

b) 4

c) 6

d) 2

Ans: c

Explanation: Six NH₃ ligands surround Co³⁺ ion.

Ques: The oxidation number of Co in [Co(C₂O₄)₃]³⁻ is:

a) +2

b) +3

c) 0

d) +1

Ans: b

Explanation: Each oxalate (C₂O₄²⁻) = −2 × 3 = −6; total charge = −3 ⇒ Co = +3.

Ques: Which of the following is an example of a bidentate ligand?

a) NH₃

b) H₂O

c) C₂O₄²⁻

d) CN⁻

Ans: c

Explanation: Oxalate ion (C₂O₄²⁻) can attach through two oxygen atoms.

Ques: In [Ni(CO)₄], Ni has an oxidation number of:

a) +2

b) 0

c) −1

d) +1

Ans: b

Explanation: CO is a neutral ligand; total charge = 0.

Ques: Which of the following is an ambidentate ligand?

a) CN⁻

b) NO₂⁻

c) NH₃

d) H₂O

Ans: b

Explanation: NO₂⁻ can coordinate via N (nitro) or O (nitrito).

Ques: [Fe(CN)₆]⁴⁻ exhibits:

a) High spin complex

b) Low spin complex

Ans: b

Explanation: CN⁻ is a strong field ligand causing pairing of electrons.

Ques: Which one of the following has a coordination number 4 and tetrahedral geometry?

a) [Ni(CN)₄]²⁻

b) [NiCl₄]²⁻

c) [Cu(NH₃)₄]²⁺

d) [Co(NH₃)₆]³⁺

Ans: b

Explanation: Cl⁻ is weak field → sp³ hybridization → tetrahedral.

Ques: In [Cr(H₂O)₆]³⁺, the type of hybridization is:

a) sp³d²

b) d²sp³

c) dsp²

d) sp³

Ans: b

Explanation: Inner orbital complex (low spin) → d²sp³ hybridization.

Ques: Which ligand causes maximum crystal field splitting?

a) Cl⁻

b) CN⁻

c) H₂O

d) NH₃

Ans: b

Explanation: CN⁻ is a strong field ligand (highest in spectrochemical series).

Ques: [Co(NH₃)₅Br]SO₄ and [Co(NH₃)₅SO₄]Br are examples of:

a) Ionization isomerism

b) Hydrate isomerism

Ans: a

Explanation: Different counter-ions in the coordination sphere.

Ques: Which pair shows linkage isomerism?

a) [Co(NH₃)₆]Cl₃

b) [Co(NO₂)(NH₃)₅]²⁺ and [Co(ONO)(NH₃)₅]²⁺

Ans: b

Explanation: NO₂⁻ can coordinate via N or O.

Ques: Which is optical isomer?

a) [Co(en)₃]³⁺

b) [Co(NH₃)₆]³⁺

Ans: a

Explanation: "en" (ethylenediamine) is bidentate → forms chiral complex.

Ques: [Pt(NH₃)₂Cl₂] shows:

a) Geometrical isomerism

b) Optical isomerism

Ans: a

Explanation: Can exist as cis and trans forms.

Ques: [CoCl₂(en)₂]⁺ has how many geometrical isomers?

a) 1

b) 2

c) 3

d) 4

Ans: b

Explanation: cis and trans possible with two bidentate ligands.

Ques: [MA₂B₂] type complexes show:

a) Geometrical isomerism

b) Ionization isomerism

Ans: a

Ques: [Co(NH₃)₆]³⁺ shows:

a) Optical

b) Geometrical

c) None

Ans: c

Explanation: All ligands same → no isomerism.

Ques: [Co(en)₂Cl₂]⁺ has:

a) Two optical isomers

b) No optical isomer

Ans: a

Ques: Which is an example of coordination isomerism?

a) [Cu(NH₃)₄][PtCl₄] and [Pt(NH₃)₄][CuCl₄]

Ans: a

Ques: Hydrate isomerism occurs in:

a) [Cr(H₂O)₆]Cl₃, [Cr(H₂O)₅Cl]Cl₂·H₂O

Ans: True

Explanation: Differ in number of coordinated water molecules.

Ques: Which theory explains color and magnetism of complexes?

a) Valence Bond Theory

b) Crystal Field Theory

Ans: b

Ques: In [Fe(CN)₆]⁴⁻, Fe is:

a) diamagnetic

b) paramagnetic

Ans: a

Explanation: CN⁻ causes pairing → no unpaired electrons.

Ques: Hybridization in [Ni(CN)₄]²⁻ is:

a) sp³

b) dsp²

Ans: b

Explanation: Square planar, low spin → dsp².

Ques: [Cu(NH₃)₄]²⁺ color is due to:

a) Charge transfer

b) d–d transition

Ans: b

Ques: Colorless complex forms when:

a) No unpaired d-electrons

Ans: a

Ques: Which is paramagnetic?

a) [Co(NH₃)₆]³⁺

b) [Fe(H₂O)₆]²⁺

Ans: b

Explanation: Fe²⁺ has 4 unpaired electrons.

Ques: Valence bond theory fails to explain:

a) Color

Ans: a

Ques: In tetrahedral field splitting, Δt is:

a) smaller than Δo

Ans: a

Ques: CFSE for high-spin d⁵ octahedral =

a) 0

Ans: a

Ques: Ligand field strength order:

Cl⁻ < H₂O < NH₃ < CN⁻

Ques: [Cr(H₂O)₄Cl₂]Cl name:

Ans: Tetraaquadichloridochromium(III) chloride

Ques: [Co(NH₃)₆]Cl₃ name:

Ans: Hexaamminecobalt(III) chloride

Ques: [Pt(NH₃)₂Cl₂] name:

Ans: Diamminedichloridoplatinum(II)

Ques: [Fe(C₂O₄)₃]³⁻ name:

Ans: Trioxalatoiron(III)

Ques: [Cu(NH₃)₄]SO₄ name:

Ans: Tetraamminecopper(II) sulfate

Ques: [Ag(NH₃)₂]⁺ name:

Ans: Diamminesilver(I)

Ques: [Ni(CO)₄] name:

Ans: Tetracarbonylnickel(0)

Ques: [Zn(NH₃)₄]²⁺ name:

Ans: Tetraamminezinc(II)

Ques: [Cr(H₂O)₆]³⁺ name:

Ans: Hexaaquachromium(III)

Ques: [Co(en)₃]³⁺ name:

Ans: Tris(ethylenediamine)cobalt(III)

Ques: Which complex is used in photography?

Ans: [Ag(NH₃)₂]⁺ — forms during silver halide dissolution.

Ques: Which compound is used in electroplating silver?

Ans: K[Ag(CN)₂]

Ques: Which complex is known as Prussian Blue?

Ans: Fe₄[Fe(CN)₆]₃

Ques: Which shows spin-only magnetic moment of 5.92 BM?

Ans: High-spin d⁵ (Mn²⁺)

Ques: Which complex is square planar?

Ans: [Ni(CN)₄]²⁻

Ques: Which ligand forms chelates?

Ans: en, C₂O₄²⁻

Ques: Chelate effect means:

Ans: Greater stability due to ring formation.

Ques: EDTA⁴⁻ is:

Ans: Hexadentate ligand.

Ques: Coordination number depends on:

Ans: Number of donor atoms bonded to central metal.

Ques: Which of the following complexes is colorless?

a) [Sc(H₂O)₆]³⁺

Ans: a

Explanation: Sc³⁺ has no d-electrons → no d–d transition.