Please refer to Chapter 9 Coordination Compounds MCQ Class 12 Chemistry with answers below. These multiple-choice questions have been prepared based on the latest NCERT book for Class 12 Chemistry. Students should refer to MCQ Questions for Class 12 Chemistry with Answers to score more marks in Grade 12 Chemistry exams. Students should read the chapter Coordination Compounds and then attempt the following objective questions.

MCQ Questions Class 12 Chemistry Chapter 9 Coordination Compounds

Coordination Compounds MCQ Class 12 Chemistry provided below covers all important topics given in this chapter. These MCQs will help you to properly prepare for exams.

Question. CrCl₃ has primary valence of
(a) 3
(b) 4
(c) 2
(d) 1

Question. K₄[Fe(CN)₆ ] is a :
(a) double salt
(b) complex compound
(c) acid
(d) base

Question. The solution of K₄[Fe(CN)₆] in water will
(a) give a test K⁺
(b) give a test Fe²⁺
(c) give a test of CN^–
(d) give a test of [Fe(CN)₆]^4–

Question. In the coordination compound, K₄[Ni(CN)₄], the oxidation state of nickel is
(a) 0
(b) +1
(c) +2
(d) –1

Question. According to the postulates of Werner for coordination compounds
(a) primary valency is ionizable
(b) secondary valency is ionizable
(c) primary and secondary valencies are non-ionizable
(d) only primary valency is non-ionizable.

Question. The number of ions formed on dissolving one molecule of FeSO₄(NH₄)₂SO₄.6H₂O in water is:
(a) 4
(b) 5
(c) 3
(d) 6

Question. Ligand in a complex salt are
(a) anions linked by coordinate bonds to a central metal atom or ion
(b) cations linked by coordinate bonds to a central metal or ion
(c) molecules linked by coordinate bonds to a central metal or ion
(d) ions or molecules linked by coordinate bonds to a central atom or ion

Question. The ligand N(CH₂CH₂NH₂)₃ is
(a) tridentate
(b) pentadentate
(c) tetradentate
(d) bidentate

Question. The coordination number of a central metal atom in a complex is determined by
(a) the number of ligands around a metal ion bonded by sigma and pi-bonds both
(b) the number of ligands around a metal ion bonded by pi-bonds
(c) the number of ligands around a metal ion bonded by sigma bonds
(d) the number of only anionic ligands bonded to the metal ion.

Question. The compound having the lowest oxidation state of iron is:
(a) K₄Fe(CN)₆
(b) K₂FeO₄
(c) Fe₂O₃
(d) Fe(CO)₅

Question. Which of the following postulates of Werner’s theory is incorrect?
(a) Primary valencies are satisfied by negative ions.
(b) Secondary valencies are satisfied by neutral molecules or negative ions.
(c) Secondary valence is equal to the coordination number and it depends upon the nature of ligand attached to metal.
(d) The ions/ groups bound by the secondary linkages to the metal have charecteristic spatial arrangements.

Question. According to Lewis, the ligands are
(a) acidic in nature
(b) basic in nature
(c) some are acidic and others are basic
(d) neither acidic nor basic

Question. An example of ambidentate ligand is
(a) Ammine
(b) Aquo
(c) Chloro
(d) Thiocyanato

Question. The coordination number and the oxidation state of the element ‘E’ in the complex [E(en)₂ (C₂O₄)]NO₂ (where (en) is ethylene diamine) are, respectively,
(a) 6 and 2
(b) 4 and 2
(c) 4 and 3
(d) 6 and 3

Question. Coordination number of Ni in [Ni(C₂O₄)₃]^4– is
(a) 3
(b) 6
(c) 4
(d) 5

Question. Which of the following does not form a chelate ?
(a) EDTA
(b) Oxalate
(c) Pyridine
(d) Ethylenediamine

Question. Some salts although containing two different metallic elements give test for only one of them in solution. Such salts are
(a) complex
(b) double salts
(c) normal salts
(d) None of these

Question. The effective atomic number of Cr ( atomic number = 24) in [Cr(NH₃ )₆ ]CI₃ is
(a) 35
(b) 27
(c) 33
(d) 36

Question. Which of the following is hexadentate ligand ?
(a) Ethylene diamine 
(b) Ethylene diamine tetra acetic acid
(c) 1, 10-phenanthroline
(d) Acety 1 acetonato

Question. In the coordination compound, K₄ [Ni(CN)₄ ], the oxidation state of nickel is
(a) – 1
(b) 0
(c) + l
(d) + 2

Question. The number of unidentate ligands in the complex ion is called 
(a) oxidation number
(b) primary valency
(c) coordination number
(d) EAN

Question. The oxidation state of iron in K₄ [Fe(CN)₆ ] is
(a) 1
(b) 4
(c) 3
(d) 2

Question. Which complex cannot ionise in solution? 
(a) [CoCl₃ (NH₃)₃]
(b) K₄[Fe(CN)₆]
(c) K₂[Pt(F₆)]
(d) [Pt(NH₃)₆] Cl₄

Question. The oxidation number of platinum in [Pt(NH₃ )₅ Cl]Cl₃ is
(a) 2
(b) 3
(c) 4
(d) 6

Question. What is the EAN of nickel in Ni(CO)₄?
(a) 38
(b) 30
(c) 36
(d) 32

Question. The tetrahedral complexes have coordination number
(a) 3
(b) 6
(c) 4
(d) 5

Question. The coordination number of a central metal atom in a complex is determined by 
(a) the number of ligands around a metal ion bonded by σ-bonds
(b) the number of ligands around a metal ion bonded by π-bonds
(c) the number of ligands around a metal ion bonded by σ- and π-bonds both
(d) the number of only anionic ligands bonded to the metal ion

Question. How many EDTA (ethylenediaminetetraacetic acid) molecules are required to make an octahedral complex with a Ca²⁺ ion ?
(a) six
(c) one
(b) three
(d) two

Question. [Pt(NH₃ )₆ ]Cl₄ complex gives 
(a) 4 ions
(b) 3 ions
(c) 2 ions
(d) 5 ions

Question. The coordination number of Cu in [Cu(H₂O)₄ ]²⁺ complex is 
(a) 2
(b) 1
(c) 3
(d) 4

Question. The metal ion in complex A has EAN identical to the atomic number of krypton. A is (atomic number of Cr= 24, Fe= 26, Pd = 46) 
(a) [Pd(NH₃ )₆ ]Cl₄
(b) [Cr(NH₃ )₅ Cl]SO₄
(c) Na₄[Fe(CN)₆]
(d) K₃[Fe(CN)₆]

Question. The complex that doesn’t give a precipitate with AgNO₃ solution 
(a) [Co(NH₃ )₆ Cl₃ ]
(b) [Co(NH₃ )₆ ]Cl₃
(c) [Ag(NH₃ )₂]Cl
(d) [Cr(NH₃ )₄ CI₂ ]Cl

Question. The number of moles of ions given on complete ionisation ofone mole of[Co(NH₃ )₆ ]Cl₃ is/are 
(a) 4
(b) 3
(c) 2
(d) 1

Question. The coordination number in a/an ………. complex may increase to 8. 
(a) cobalt
(b) osmium
(c) nickel
(d) iron

Question. The oxidation state of Cr in [Cr(NH₃ )₄ Cl₂ t is
(a) 0
(b) + 1 
(c) + 2
(d) + 3

Question. The coordination number and oxidation number of X in the following compound [X(SO₄ )(NH₃ )₅] Cl will be
(a) 10 and 3
(b) 2 and 6 
(c) 6 and 3
(d) 6 and 4

Question. Which compound is zero valent metal complex? 
(a) [Cu(NH₃ )₄]SO₄
(b) [Pt(NH₃ )₂ Cl₂ ]
(c) [Ni(CO)₄]
(d) K₃ [Fe(CN)₆]

Question. The compound having the lowest oxidation state of iron is
(a) K₄Fe(CN)₆
(b) K₂FeO₄ 
(c) Fe₂O₃
(d) Fe(CO)₅

Question. Which one does not belong to ligand?
(a) PH₃
(b) NO⁺
(c) BF₃
(d) Cl^–

Question. Choose the correct statement.
(a) Coordination number has nothing to do with the number of groups or molecules attached to the central atom
(b) Coordination number is the number of coordinating sites of all the ligands connected to the central atom or the number of coordinate bonds formed by the metal atom with ligands
(c) Werner’s coordination theory postulates only one type of valency
(d) All the above are correct

Question. O₂ is a
(a) Monodentate ligand
(b) Bidenate ligand
(c) Tridentate ligand
(d) Hexadenate ligand

Question. A chelating agent has two or more than two donor atoms to bind to a single metal ion. Which of the following is not a helating agent ?
(a) thiosulphato
(b) oxalato
(c) glycinato
(d) ethane – 1, 2-diamine

Question. A bidenate ligand always
(a) has bonds formed to two metals ions
(b) has a charge of +2 or – 2
(c) forms complex ions with a charge of +2 or –2
(d) has two donor atoms forming simultaneously two sigma (σ) bonds.

Question. Which of the following species is not expected to be a ligand?
(a) NO
(b) NH₄⁺
(c) NH₂CH₂CH₂NH₂
(d) Both (a) and (b)

Question. Which ligand is expected to be bidentate?
(a) C₂O²₄⁻
(b) CH3C ≡ N
(c) Br ^–
(d) CH₃NH₂

Question. Which one of the following ligands forms a chelate
(a) Acetate
(b) Oxalate
(c) Ammonia
(d) Cyanide

Question. The IUPAC name of the coordination compound K₃[Fe(CN)₆ ] is
(a) Tripotassium hexacyanoiron (II)
(b) Potassium hexacyanoiron (II)
(c) Potassium hexacyanoferrate (III)
(d) Potassium hexacyanoferrate (II)

Question. An ambident ligand is one which
(a) is linked to the metal atom through two donor atoms
(b) has two donor atoms, but only one of them has the capacity to form a coordinate bond [or a sigma (σ) bond]
(c) has two donor atoms, but either of two can form a coordinate bond
(d) forms chelate rings.

Question. The IUPAC name of K₃[Ir(C₂O₄)₃] is
(a) potassium trioxalatoiridium (III)
(b) potassium trioxalatoiridate (III)
(c) potassium tris (oxalato) iridium (III)
(d) potassium tris (oxalato) iridate (III)

Question. IUPAC name of Na₃[Co(ONO)₆] is
(a) Sodium cobaltinitrite
(b) Sodium hexanitrito cobaltate (III)
(c) Sodium hexanitrocobalt (III)
(d) Sodium hexanitritocobaltate (II)

Question. Which of the following is the correct name of compound. [Co(NH₃)₄(H₂O)Cl]Cl₂ 
(a) Tetraamineaqua chloride cobalt (III) chloride
(b) Tetraamineaqua chlorido cobalt (II) chloride
(c) Tetraamineaqua chloride cobalt (II) chloride
(d) Tetraamineaqua chlorido cobalt (III) chloride

Question. K₃[Al(C₂O₄ )₃] is called
(a) Potassium aluminooxalate
(b) Potassium trioxalatoaluminate (III)
(c) Potassium aluminium (III) oxalate
(d) Potassium trioxalatoaluminate (VI)

Question. The number of geometrical isomers for [Pt(NH₃)₂Cl₂] is
(a) 2
(b) 1
(c) 3
(d) 4

Question. Which of the following coordination compounds would exhibit optical isomerism?
(a) pentamminenitrocobalt(III) iodide
(b) diamminedichloroplatinum(II)
(c) trans-dicyanobis (ethylenediamine) chromium (III) chloride
(d) tris-(ethylendiamine) cobalt (III) bromide

Question. Coordination isomerism is caused by the interchange of ligands between the
(a) cis and trans structure
(b) complex cation and complex anion
(c) inner sphere and outer sphere
(d) low oxidation and higher oxidation states

Question. A similarity between optical and geometrical isomerism is that
(a) each gives equal number of isomers for a given compound
(b) if in a compound one is present then so is the other
(c) both are included in stereoisomerism
(d) they have no similarity

Question. Which of the following is the limitation of crystal field theory?
(i) Ligands are assumed as point charges.
(ii) It does not accounts for the covalent character of bonding between the ligand and the central atom.
(iii) It does not explain how colour of coordination compounds depends on ligand attached to central metal atom/ion.
(a) (i) and (ii)
(b) (ii) and (iii)
(c) (ii) only
(d) (i), (ii) and (iii)

Question. If magnetic moment of [MnBr₄]^2– is 5.9 BM. Predict the number of electrons?
(a) 2
(b) 3
(c) 6
(d) 5

Question. Change in composition of co-ordination sphere yields which type of isomers
(a) optical
(b) geometrical
(c) ionisation
(d) None of these

Question. The type of isomerism present in nitropentaamminechromium (III) chloride is
(a) optical
(b) linkage
(c) ionization
(d) polymerization

Question. The complex, [Pt(py)(NH₃)BrCl] will have how many geometrical isomers ?
(a) 3
(b) 4
(c) 0
(d) 2

Question. The charge on the central metal ion in the complex [Ni(CO)₄] is
(a) + 2
(b) + 4
(c) 0
(d) + 3

Question. Coordination compounds have great importance in biological systems. In this context which of the following statements is incorrect ?
(a) Cyanocobalamin is B1₂ and contains cobalt
(b) Haemoglobin is the red pigment of blood and contains iron
(c) Chlorophylls are green pigments in plants and contain calcium
(d) Carboxypeptidase – A is an exzyme and contains zinc.

Question. Identify the correct statements for the behaviour of ethane- 1, 2-diamine as a ligand.
(i) It is a neutral ligand.
(ii) It is a didentate ligand.
(iii) It is a chelating ligand.
(iv) It is a unidentate ligand.
(a) (i), (ii) and (iii)
(b) (ii) and (iii)
(c) (iii) and (iv)
(d) (i), (iii) and (iv)

Question. Total number of electron count in Ni(CO)₄ and Fe(CO)₅ respectively are.
(a) 36, 36
(b) 34, 36
(c) 36, 34
(d) 34, 34

Question. The unpaired electrons in Ni(CO)₄ are
(a) zero
(b) one
(c) three
(d) four

Question. According to IUPAC nomenclature sodium nitroprusside is named as
(a) Sodium pentacyanonitrosylferrate (III)
(b) Sodium nitroferrocyanide
(c) Sodium nitroferricyanide
(d) Sodium pentacyanonitrosylferrate (II)

Question. The correct structure of Fe(CO)₅ is (Z=26 for Fe)
(a) octahedral
(b) tetrahedral
(c) square pyramidal
(d) trigonal pyramidal

Question. The terahedral complex [M(A)(B)(X)(Y)], where A,B,X and Y are different ligands and M is a metal ion is
(a) optically inactive
(b) rotate plane polarized light
(c) incomplete information
(d) can’t be said

Question. The value of the ‘spin only’ magnetic moment for one of the following configurations is 2.84 BM. The correct one is
(a) d⁵ (in strong ligand field)
(b) ^d3 (in weak as well as in strong fields)
(c) d ⁴(in weak ligand fields)
(d) d⁴(in strong ligand fields)

Question. Crystal field stabilization energy for high spin d ⁴ octahedral complex is:
(a) – 1.8 Δ₀
(b) – 1.6 Δ₀ + P
(c) – 1.2 Δ₀
(d) – 0.6 Δ₀

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