Class 12 Chemistry Chapter 9 Coordination Compounds MCQ Questions with Answers

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Coordination Compounds Class 12 MCQ with Answers

Class 12 Chemistry MCQ with answers are given here to chapter The d and f Block Elements . These MCQs are based on the latest CBSE board syllabus and relate to the latest Class 12 Chemistry syllabus. By Solving these Class 12 MCQs, you will be able to analyze all of the concepts quickly in the chapter and get ready for the Class 12 Annual exam.

Learn Coordination Compounds Class 12 MCQ PDF with answers pdf free download according to the latest CBSE and NCERT syllabus. Students should prepare for the examination by solving Class 12 Coordination Compounds MCQs with answers pdf given below.

Question 1. CuSO₄ when reacts with KCN forms CuCN, which is insoluble in water. It is soluble in excess of KCN, due to formation of the following complex
(a) K₂[Cu(CN)₄]
(b) K₃[Cu(CN)₄]
(c) CuCN₂
(d) Cu[KCu(CN)₄]

Question 2. Cobalt(III) chloride forms several octahedral complexes with ammonia. Which of the following will not give test for chloride ions with silver nitrate at 25°C?
(a) CoCl₃ · 5NH₃
(b) CoCl₃ · 6NH₃
(c) CoCl₃ · 3NH₃
(d) CoCl₃ · 4NH₃

Question 3. The correct order of the stoichiometries of AgCl formed when AgNO3 in excess is treated with the complexes : CoCl₃.6NH₃, CoCl₃.5NH₃, CoCl₃.4NH₃ respectively is
(a) 3AgCl, 1AgCl, 2AgCl
(b) 3AgCl, 2AgCl, 1AgCl
(c) 2AgCl, 3AgCl, 2AgCl
(d) 1AgCl, 3AgCl, 2AgCl

Question 4. Shape of Fe(CO)₅ is
(a) octahedral
(b) square planar
(c) trigonal bipyramidal
(d) square pyramidal.

Question 5. In metal carbonyl having general formula M(CO)_x where M = metal, x = 4 and the metal is bonded to
(a) carbon and oxygen
(b) C O
(c) oxygen
(d) carbon. 

Question 6.The sum of coordination number and oxidationnumber of the metal M in the complex [M(en)2(C2O4)]Cl (where en is ethylenediamine) is
(a) 6
(b) 7
(c) 8
(d) 9

Question 7.The anion of acetylacetone (acac) forms Co(acac)3 chelate with Co3+. The rings of the chelate are
(a) five membered
(b) four membered
(c) six membered
(d) three membered.

Question 8. An excess of AgNO3 is added to 100 mL of a 0.01 M solution of dichlorotetraaquachromium(III) chloride. The number of moles of AgCl precipitated would be
(a) 0.003
(b) 0.01
(c) 0.001
(d) 0.002

 Question 9. Which of the following will exhibit maximum ionic conductivity?
(a) K₄[Fe(CN)₆]
(b) [Co(NH₃)6]Cl₃
(c) [Cu(NH₃)4]Cl₂
(d) [Ni(CO)₄]

Question 10. Coordination number of Ni in [Ni(C₂O₄)₃]⁴– is
(a) 3
(b) 6
(c) 4
(d) 2 

Question 11. Which of the following statements is true?
(a) Silicon exhibits 4 coordination number in its compound.
(b) Bond energy of F₂ is less than Cl₂.
(c) Mn(III) oxidation state is more stable than Mn(II) in aqueous state.
(d) Elements of 15^th gp shows only +3 and +5 oxidation states

Question 12. The name of complex ion, [Fe(CN)₆]³– is
(a) hexacyanitoferrate(III) ion
(b) tricyanoferrate(III) ion
(c) hexacyanidoferrate(III) ion
(d) hexacyanoiron(III) ion. 

Question 13. The coordination number and oxidation state of Cr in K₃[Cr(C₂O₄)³] are respectively
(a) 3 and + 3
(b) 3 and 0
(c) 6 and + 3
(d) 4 and + 2 

Question 14. Which of the following ligands is expected to be bidentate?
(a) CH₃NH₂
(b) CH₃C N
(c) Br
(d) C2O₄^2-

 Question 15. The complexes [Co(NH₃)₆][Cr(CN)₆] and [Cr(NH₃)₆][Co(CN)₆] are the examples of which type of isomerism?
(a) Linkage isomerism
(b) Ionization isomerism
(c) Coordination isomerism
(d) Geometrical isomerism 

Question 16. Which of the following complexes is used to be as an anticancer agent?
(a) mer-[Co(NH₃)₃Cl₃]
(b) cis-[PtCl₂(NH₃)₂]
(c) cis-K₂[PtCl₂Br₂]
(d) Na₂CoCl₄ 

Question 17. The correct IUPAC name for [CrF₂(en)₂]Cl is
(a) chlorodifluoridoethylenediaminechromium (III) chloride
(b) difluoridobis(ethylene diamine)chromium (III) chloride
(c) difluorobis-(ethylene diamine)chromium (III) chloride
(d) chlorodifluoridobis(ethylene diamine) chromium (III). 

Question 18. The hypothetical complex chlorodiaquatriammine cobalt(III) chloride can be represented as
(a) [CoCl(NH₃)₃(H₂O)₂]Cl₂
(b) [Co(NH₃)₃(H₂O)Cl₃]
(c) [Co(NH₂)₃(H₂O)₂Cl]
(d) [Co(NH₃)₃(H₂O)₃]Cl₃

Question 19. IUPAC name of [Pt(NH₃)₃(Br)(NO₂)Cl]Cl is
(a) triamminebromochloronitroplatinum(IV) chloride
(b) triamminebromonitrochloroplatinum(IV) chloride
(c) triamminechlorobromonitroplatinum(IV) chloride
(d) triamminenitrochlorobromoplatinum(IV) chloride.

Question 20. When EDT A solution is added to Mg²⁺ ion solution, then which of the following statements is not true? 
(a) Four coordinate sites of Mg²⁺ are occupied by EDTA and remaining two sites are occupied by water molecules
(b) All six coordinate sites of Mg²⁺ are occupied
(c) pH of the solution is decreased.
(d) Colourless [Mg-EDTA]^2- chelate is formed

Question 21. Copper sulphate dissolves in excess of KCN to give
(a) Cu(CN)₂
(b) CuCN
(c) [Cu(CN)₄]^3–
(d) [Cu(CN)₄]^2– 

Question 22. Which complex compound possesses sp³ d² hybtidisation?
(a) [Fe(NH₃)₆ ]³⁺
(b) [Fe(CN)₆ ]^4- 
(c) [Fe(CN)₆ ]^3-
(d) [Fe(Cl)₆ ]^3-

Question 23. The number of unpaired electrons calculated in [Co(NH₃)₆ ]³⁺ and [Co(F₆ )]^3- are 
(a) 4 and 4
(b) 0 and 2
(c) 2 and 4
(d) 0 and 4

Question 24. An octahedral complex is fom1ed when hybrid orbitals of the following type are involved 
(a) sp³
(b) dsp²
(c) d²sp³
(d) sp²d²

Question 25. In which of the following octahedral complexes of Co (atomic number 27) will be magnitude of Δ_o be the hlghest? 
(a) [Co(CN)₆]^3-
(b) [Co(C₂O₄)₃]^3-
(c) [Co(H₂O)₆]³⁺
(d) [Co(NH₃)₆]³⁺

Question 26. The reaction, [Fe(CNS)₆ ]^3- → [FeF₆ ]³– talces place with 
(a) decrease in magnetic moment
(b) increase in magnetic moment
(c) decrease in coordination number
(d) increase in coordination number

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Question 27. Which of the following shell, form only an outer octahedral complex ? 
(a) d⁴
(b) d⁸
(c) d⁶
(d) None of these

Question 28. Hybridisation, shape and magnetic moment of K₃[Co(CO₃)₃ ] is
(a) d²sp³ , octahedral, 4.9 BM
(b) sp³d ², octahedral, 4.9 BM
(c) dsp² , square planar, 4.9 BM
(d) sp³, tetrahedral, 4.9 BM

Question 29. [Ni(CN)₄ ]^2- , [MnBr₄ ]^2- and [CoF₆ ]^3- , geometry,hybridisation and magnetic moment of the ions respectively,are
(a) tetrahedral, square planar, octahedral :
                sp³, dsp², sp³d² : 5.9, 0, 4.9
(b) tetrahedral, square planar, octahedral:
               dsp² , sp³ , sp³d² : 0, 5.9, 4.9
(c) square planar, tetrahedral, octahedral:
               dsp² ,sp³ , d²sp³ : 5.9, 4.9, 0
(d) square planar, tetrahedral, octahedral:
               dsp², sp³, sp³d² : 0, 5.9, 4.9

Question 30. In which of the following complex ion, the central metal ion is in a state of sp³d² hybridisation?
(a) [CoF₆)]^3-
(b) [Co(NH₃)₆ ]³⁺
(c) [Fe(CN)₆]
(d) [Cr(NH₃)₆ ]³⁺

Question 31. The number of unpaired electrons in the square planar [Pt(CN)₄ ]^2- ion is 
(a) 2
(b) 1
(c) 0
(d) 3

Question 32. Which has maximum paramagnetic character? 
(a) [Fe(CN)₆ ]^4-
(b) [Cu(H₂O)₄ ]²⁺
(c) [Cu(NH₃ )₄ ]²⁺
(d) [Mn(H₂O)₆ ]²⁺

Question 33. Among [Ni(CO)₄ ]^2- , [Ni(CN)⁴ ]^2- and [NiCl₄ ]^2- species, the hybridisation states of the Ni atom are, respectively (Atomic number of Ni= 28) 
(a) sp³, dsp², dsp²
(b) sp³, dsp²,sp³
(c) sp³, sp³, dsp²
(d) dsp², sp³, sp

Question 34. Which one of the following has a square planar geometry? (Atomic Number of Fe= 26, Co= 27, Ni= 28, Pt= 78)
(a) [CoCl₄ ]^2-
(b) [FeCl₄ ]^2- 
(c) [NiCl₄ ]^2-
(d) [PtCl₄ ]^2-

Question 35. Which of the following complex has zero magnetic moment (spin only)? 
(a) [Ni(NH₃ )₆ ]Cl₂
(b) Na₃[FeF₆]
(c) [Cr(H₂O)₆]SO₄
(d) K₄[Fe(CN)₆]

Question 36. Considering H₂O as weak field ligand, the number of unpaired electrons in [Mn(H₂O)₆ ]²⁺ will be
(Atomic number of Mn = 25)
(a) three
(b) five
(c) two
(d) four

Question 37. In an octahedral structure, the pair of d-orbitals involved in d²sp ³ hybridisation is 
(a) d_{x² – y²} ,d_z²
(b) d_xz ,d_{x² – y²}
(c) d_z² ,d_xz 
(d) d_xy ,d_yz

Question 38. CN- is strong field ligand. This is due to the fact that
(a) it carries negative charge 
(b) it is a pseudohalide
(c) it can accept electrons from metal species
(d) it forms high spin complexes with metal species

Question 39. Which of the following statements is not correct?
(a) The complexes [NiCl₄]^2- and [Ni(CN)₄]^2- differ in the state of hybridisation ofnickel
(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 geometry
(d) The complexes [NiCl₄]^2- and [Ni(CN)₄]^2-– differ in primary valencies of nickel
(e) Nickel ion has the same secondary valency in the complexes [NiCl₄]^2- and [Ni(CN)₄]^2-

Question 40. The geometry of Ni(CO)₄ and Ni(PPh₃)₂ Cl₂ are
(a) both square planar 
(b) tetrahedral and square planar respectively
(c) both tetrahedral
(d) square planar and tetrahedral respectively

Question 41. Ammonia forms the complex ion [Cu(NH₃ )₄ ]²⁺ with copper ions in the alkaline solutions but not in acidic solutions. What is the reason for it ?
(a) In acidic solutions hydration protects copper ions
(b) In acidic solutions protons coordinate with ammonia molecules forming NH⁺₄ ions and NH₃ molecules are not available
(c) In alkaline solutions insoluble Cu(OH)₂ is precipitated which is soluble in excess of any alkali
(d) Copper hydroxide is an amphoteric substance

Question 42. The complex, [Pt(py)(NH₃)BrCl] will have how many geometrical isomers?
(a) 3
(b) 4
(c) 0
(d) 2

Question 43. The existence of two different coloured complexes with the composition of [Co(NH₃)₄Cl₂]+ is due to
(a) linkage isomerism
(b) geometrical isomerism
(c) coordination isomerism
(d) ionization isomerism

Question 44. In the silver plating of copper, K[Ag(CN)₂] is used instead of AgNO₃. The reason is
(a) a thin layer of Ag is formed on Cu
(b) more voltage is required
(c) Ag⁺ ions are completely removed from solution
(d) less availability of Ag⁺ ions, as Cu cannot displace Ag from [Ag(CN)₂]^– ion.

 Question 45. Which of the following will give a pair of enantiomorphs?
(a) [Cr(NH₃)₆][Co(CN)₆]
(b) [Co(en)₂Cl₂]Cl
(c) [Pt(NH₃)₄][PtCl₆]
(d) [Co(NH₃)₄Cl₂]NO₂ (en = NH₂CH₂CH₂NH₂

Question 46. Which one of the following complexes is not expected to exhibit isomerism?
(a) [Ni(NH₃)₄(H₂O)₂]^₂+
(b) [Pt(NH₃)₂Cl₂]
(c) [Ni(NH₃)₂Cl₂]
(d) [Ni(en)₃]²⁺

Question 47. Which of the following does not show optical isomerism?
(a) [Co(NH₃)₃Cl₃]⁰
(b) [Co(en)Cl₂(NH₃)₂]⁺
(c) [Co(en)₃]³⁺
(d) [Co(en)₂Cl₂]⁺(en = ethylenediamine)

Question 48. Which one of the following is expected to exhibit optical isomerism? (en = ethylenediamine)
(a) cis-[Pt(NH₃)₂Cl₂]
(b) trans-[Pt(NH₃)₂Cl₂]
(c) cis-[Co(en)₂Cl₂]^₊
(d) trans-[Co(en)₂Cl₂]⁺

Question 49. [CoNH(₃)₄(NO₂)₂]Cl exhibits
(a) linkage isomerism, geometrical isomerism and optical isomerism
(b) linkage isomerism, ionization isomerism and optical isomerism
(c) linkage isomerism, ionization isomerism and geometrical isomerism
(d) ionization isomerism, geometrical isomerism and optical isomerism.

Question 50. Which complex compound will give four isomers?
(a) [Fe(en)₃]Cl₃
(b) [Co(en)₂Cl₂]Cl
(c) [Fe(PPh₃)₃NH₃ClBr]Cl
(d) [Co(PPh₃)₃Cl]Cl₃

Question 51. Which of the following coordination compounds would exhibit optical isomerism?
(a) Pentaamminenitrocobalt(III) iodide
(b) Diamminedichloroplatinum(II)
(c) trans-Dicyanobis(ethylenediamine)chromium(III) chloride
(d) tris-(Ethylenediamine)cobalt(III) bromide

Question 52. Which of the following will give maximum number of isomers?
(a) [Co(NH₃)₄Cl₂](b) [Ni(en)(NH₃)₄]₂⁺
(c) [Ni(C₂O₄)(en)₂]₂^–
(d) [Cr(SCN)₂(NH₃)₄]^₊

Question 53. The crystal field stabilisation energy (CFSE) for [CoCl₆]^₄– is 18000 cm^–1. The CFSE for [CoCl₄]^₂– will be
(a) 6000 cm^–1
(b) 16000 cm^–1
(c) 18000 cm^–1
(d) 8000 cm^–1

Question 54. The total number of possible isomers for the complex compound [Cu^II(NH₃)₄][Pt^IICl₄] are
(a) 5
(b) 6
(c) 3
(d) 4 

Question 55. The number of geometrical isomers of the complex [Co(NO₂)₃(NH₃)₃] is
(a) 4
(b) 0
(c) 2
(d) 3

Question 56. A coordination complex compound of cobalt has the molecular formula containing five ammonia molecules, one nitro group and two chlorine atoms for one cobalt atom. One mole of this compound produces three mole ions in an aqueous solution. On reacting this solution with excess of AgNO3 solution, we get two moles of AgCl precipitate. The ionic formula for this complex would be
(a) [Co(NH₃)₅(NO₂)]Cl₂
(b) [Co(NH₃)₅Cl][Cl(NO₂)]
(c) [Co(NH₃)₄(NO₂)Cl][(NH₃)Cl]
(d) (Co(NH₃)₅][(NO₂)2Cl₂]

Question 57. A coordination complex compound of cobalt has the molecular formula containing five ammonia molecules, one nitro group and two chlorine atoms for one cobalt atom. One mole of this compound produces three mole ions in an aqueous solution. On reacting this solution with excess of AgNO3 solution, we get two moles of AgCl precipitate. The ionic formula for this complex would be A
(a) [Co(NH₃)₅(NO₂)]Cl₂
(b) [Co(NH₃)₅Cl][Cl(NO₂)]
(c) [Co(NH₃)₄(NO₂)Cl][(NH₃)Cl]
(d) (Co(NH₃)₅][(NO₂)2Cl₂]

Question 58. Correct increasing order for the wavelengths of absorption in the visible region for the complexes of Co³⁺ is
(a) [Co(H₂O)₆]³⁺, [Co(en)₃]³⁺, [Co(NH₃)₆]³⁺
(b) [Co(H₂O)₆]³⁺, [Co(NH₃)₆]³⁺, [Co(en)₃]³⁺
(c) [Co(NH₃)₆]³⁺, [Co(en)₃]³⁺, [Co(H₂O)₆]³⁺
(d) [Co(en)₃]³⁺, [Co(NH₃)₆]³⁺, [Co(H₂O)₆]³⁺

Question 59. Pick out the correct statement with respect to [Mn(CN)₆]^3–.
(a) It is sp³d² hybridised and tetrahedral.
(b) It is d²sp³ hybridised and octahedral.
(c) It is dsp² hybridised and square planar.
(d) It is sp³d² hybridised and octahedral.

Question 60. Jahn–Teller effect is not observed in high spin complexes of
(a) d⁷
(b) d⁸
(c) d⁴
(d) d⁹

Question 61. The correct increasing order of trans-effect of thefollowing species is
(a) NH₃ > CN– > Br– > C6H₅–
(b) CN– > C6H5– > Br– > NH₃
(c) Br– > CN– > NH₃ > C₆H₅–
(d) CN– > Br– > C₆H₅– > NH₃

Question 62. The geometry and magnetic behaviour of the complex [Ni(CO)₄] are
(a) square planar geometry and diamagnetic
(b) tetrahedral geometry and diamagnetic
(c) square planar geometry and paramagnetic
(d) tetrahedral geometry and paramagnetic.

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