MCQ Question for Class 12 Chemistry Chapter 9 Coordination Compounds

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Coordination Compounds MCQ Questions for Class 12 Chemistry with Answers

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Coordination Compounds MCQ Questions for Class 12

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

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

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

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

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

Question. 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. [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. 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

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

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

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

Question. 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. 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. 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. 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. 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.

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

Question. A compound has an empirical formula CoCl₃.5NH₃. When an aqueous solution of this compound is mixed with excess of silver nitrate, 2 moles of AgCl precipitates per mole of the compound. Hence the compound is
(a) [Co(NH₃)₅Cl₂]Cl
(b) [Co(NH₃)₅Cl]Cl₂
(c) [Co(NH₃)₅Cl₃]
(d) [Co(NH₃)₄Cl₂]Cl.NH₃

Question. The oxidation state of cobalt in the following comples is [Co(NH₃)₄Cl₂]Cl:
(a) +1
(b) +2
(c) +3
(d) 0

Question. The IUPAC name for [Pt(NH₃)₃(Br)(NO₂)(Cl)]Cl is
(a) triamminechlorobromonitroplatinum(IV) chloride
(b) triamminebromochloronitroplatinum(IV) chloride
(c) triaminenitrochlorobromoplatinum(IV) chloride
(d) triamminechloronitrobromoplatinum(IV) chloride

Question. Ethylene diamine is an example of a ………. ligand :
(a) monodentate
(b) bidentate
(c) tridentate
(d) hexadentate

Question.The complex [Pt(NH₃)₄]²⁺ has ….. structure :
(a) square planar
(b) tetrahedral
(c) pyramidal
(d) pentagonal

Question.The number of unpaired electrons in d6, low spin, octahedral complex is :
(a) 4
(b) 2
(c) 1
(d) 0

Question.Which ion would you expect to have the largest splitting of d-orbitals?
(a) [Fe(CN)₆]^4-
(b) [Fe(CN)₆]^3-
(c) [Fe(H₂O)₆]²⁺
(d) [Fe(H₂O)₆]³⁺

Question.Statement-1: [Co(NH₃)₃Cl₃] does not give white precipitate with AgNO₃ solution.
Statement-2: Chlorine is not present in the ionisable part of the given complex.
(a) If both the statements are true and statement-2 is the correct explanation of statement
(b) If both the statements are true but statement-2 is not the correct explanation of statement-1.
(c) If statement-1 is True and statement-2 is False.
(d) If statement-1 is False and statement-2 is True.

Question.The magnetic moment of a complex ion is 2.83 BM. The complex ion is
(a) [Cr(H₂O)₆]³⁺
(b) [Cu(CN)₄]^2-
(c) [V(H₂O)₆]³⁺
(d) [MnCl₄]^2-

Question. Which of the following complex has five unpaired electrons
(a) [Mn(H₂O)₆]²⁺
(b) [Mn(CN)₆]^3-
(c) [CrCl₃(H₂O)₃]
(d) [Ag(NH₃)₂]⁺

Question. Among the following ions, which one has the highest paramagnetism ?
(a) [Cr(H₂O)₆]³⁺
(b) [Fe(H₂O)₆]²⁺
(c) [Cu(H₂O)₆]²⁺
(d) [Zn(H₂O)₆]²⁺

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