Please refer to the MCQ Questions for Class 12 Chemistry Chapter 9 Coordination Compounds with Answers. The following Coordination Compounds Class 12 Chemistry MCQ Questions have been designed based on the latest syllabus and examination pattern for Class 12. Our experts have designed MCQ Questions for Class 12 Chemistry with Answers for all chapters in your NCERT Class 12 Chemistry book.
Coordination Compounds Class 12 MCQ Questions with Answers
See below Coordination Compounds Class 12 Chemistry MCQ Questions, solve the questions and compare your answers with the solutions provided below.
Question. A magnetic moment at 1.73 BM will beshown by one among of the following
(a) TiCl4
(b) [CoCl6]4–
(c) [Cu(NH3)4]2+
(d) [Ni(CN)4]2–
Answer
C
Question. Crystal field splitting energy for high spin d4 octahedral complex is
(a) – 1.2 Do
(b) – 0.6 Do
(c) – 0.8 Do
(d) – 1.6 Do
Answer
B
Question. Which among the following is a paramagnetic complex?
(a) [Co(NH3)6]3+
(b) [Pt(en)Cl2]
(c) [CoBr4]2–
(d) Mo(CO)6 (At. No. Mo = 42, Pt = 78)
Answer
C
Question. Which is diamagnetic?
(a) [CoF6]3–
(b) [Ni(CN)4]2–
(c) [NiCl4]2–
(d) [Fe(CN)6]3–
Answer
B
Question Which one of the llowing is an outer orbital complex and exhibits paramagnetic behaviour?
(a) [Ni(NH3)6]2+
(b) [Zn(NH3)6]2+
(c) [Cr(NH3)6]3+
(d) [Co(NH3)6]3+
Answer
A
Question. Low spin complex of d6-cation in an octahedral field will have the following energy
(a) −12/5 Δo +P
(b) −12/5 Δo +3P
(c)−2/5 Δo +2P
(d) −2/5 Δo +P
Answer
B
Question. The formula of dichlorobis(urea)copper(II) is
(a) [Cu {O= C(NH2)2} Cl]Cl
(b) [CuCl2] {O= C(NH2)2}
(c) [Cu {O= C(NH2)2}Cl2
(d) [CuCl2 {O= C(NH2)2}2]
Answer
D
Question. The type of isomerism shown by the complex [CoCl2(en)2] is
(a) geometrical isomerism
(b) coordination isomerism
(c) ionization isomerism
(d) linkage isomerism.
Answer
A
Question. Number of possible isomers for the complex [Co(en)2Cl2]Cl will be (en = ethylenediamine)
(a) 1
(b) 3
(c) 4
(d) 2
Answer
B
Question. Of the following complex ions, which is diamagnetic in nature?
(a) [NiCl4]2–
(b) [Ni(CN)4]2–
(c) [CuCl4]2–
(d) [CoF6]3–
Answer
B
Question. The d-electron configurations of Cr2+, Mn2+, Fe2+ and Co2+ are d4, d5, d6 and d7 respectively. Which one of the following will exhibit minimum paramagnetic behaviour?
(a) [Mn(H2O)6]2+
(b) [Fe(H2O)6]2+
(c) [Co(H2O)6]2+
(d) [Cr(H2O)6]2+
(At. nos. Cr = 24, Mn = 25, Fe = 26, Co = 27)
Answer
C
Question Which of the following complex compounds will exhibit highest paramagnetic behaviour?
(a) [Ti(NH3)6]3+
(b) [Cr(NH3)6]3+
(c) [Co(NH3)6]3+
(d) [Zn(NH3)6]2+
(At. No. Ti = 22, Cr = 24, Co = 27, Zn = 30)
Answer
B
Question4. Which of the following complex ions is not expected to absorb visible light?
(a) [Ni(CN)4]2–
(b) [Cr(NH3)6]3+
(c) [Fe(H2O)6]2+
(d) [Ni(H2O)6]2+
Answer
A
Question. Crystal field stabilization energy for high spin d4 octahedral complex is
(a) – 1.8Δo
(b) – 1.6Δo + P
(c) – 1.2Δo
(d) – 0.6Δo
Answer
D
Question. Out of TiF6 2–, CoF63–, Cu2Cl2 and NiCl42– (Z of Ti = 22, Co = 27, Cu = 29, Ni = 28) the colourless species are
(a) Cu2Cl2 and NiCl42–
(b) TiF62– and Cu2Cl2
(c) CoF63– and NiCl42–
(d) TiF62– and CoF63–.
Answer
B
Question. The magnetic moment of[Co(NH3)6 ]Cl3 is
(a) 1.73
(b) 2.83
(c) 6.6
(d) zero
Answer
D
Question. Hybridisation, shape and magnetic moment of [Ni( CN)4]2- ion
(a) dsp2, square planar, zero
(b) dsp2, square planar, 1.73
(c) sp3d2, octahedral, zero
(d) d2sp3, octahedral, 1.73
Answer
A
Question. Excited state configuration of Mn2+ is
(a) t42g
(b) t32ge2g
(c) t42ge2g
(d) t52ge0g
Answer
B
Question. Potassium ferrocyanide is an example of
(a) tetrahedral
(b) octahedral
(c) square planar
(d) linear
Answer
B
Question. The number of unpaired electrons in Ni(CO)4 is
(a) 0
(b) 1
(c) 3
(d) 4
Answer
A
Question. Which one of the following shows maximum value of paramagnetic behaviour?
(a)[Sc(CN)6]3-
(b)[Co(CN)6]3-
(c) [Ni(CN)4]2-
(d) [Cr(CN)6]3-
Answer
D
Question. Which one of the following has square planar structure?
(a)[Ni(CN)4 ]2-
(b) [Ni(CO)4 ]
(c) [NiCl4 ]2-
(d) All of these
Answer
A
Question. The type of hybridisation in tetrahedral complexes of metal atom is
(a) dsp2
(b) d2sp
(c) sp3
(d) sp2
Answer
C
Question. The con-ect order of magnetic moments (spin only values in BM) among the following is
(atomic number of Mn= 25, Fe = 26, Co = 27)
(a) [MnCl4]2- > [CoCl4]2- > [Fe(CN)6]4-
(b) [MnCl4]2- > [Fe(CN)6]4- > [CoCl4]2-
(c) [Fe(CN)6]4- > [MnCl4]2- > [CoCl4]2-
(d) [Fe(CN)6]4- > [CoCl4]2-– > [MnCl4]2-
Answer
A
Question. Nickel (Z = 28)combines with a uninegative monodentate ligand x – to form a paramagnetic complex [NiX4 ]2- . The number of unpaired electron(s) in the nickel and geometry of this complex ion are respectively
(a) one, tetrahedral
(b) two, tetrahedral
(c) one, square planar
(d) two, square planar
Answer
B
Question. The crystal field splitting energy for octahedral (Δo) and tetrahedral (Δt) complexes is related to
(a) Δt = 4 / 9 Δo
(b) Δt = 1 / 2 Δo
(c) Δo = 2 Δt
(d) Δo = 4 / 9 Δt
Answer
A
Question. The ion which exhibits green colour
(a) Cu2+
(b) Mn2+
(c) Co2+
(d) Ni2+
Answer
D
Question. Which of the following is diamagnetic in nature ?
(a)[Fe(CN)6]3-
(b)[NiCl4]2-
(c) [Ni(CO)4]
(d) [MnCl4]2-
Answer
C
Question. Which of the following complexes are not correctly matched with hybridisation of their central metal ion ?
I. [Ni(CO)4]sp3
II. [Ni(CN)4]2- sp3
III. [CoF6]3- d2sp3
IV. [Fe(CN6]3- sp3d2
Select the correct answer using the codes given below
(a) I and II
(b) I and III
(c) II and IV
(d) I, III and IV
(e) II, III and IV
Answer
E
Question. Which of the following statements is not correct?
(a) In oxyhaemoglobin Fe2+ is paramagnetic
(b) During respiration the size of Fe2+ increases whenit changes from diamagnetic to paramagnetic state
(c) Four haeme groups are present in haemoglobin
(d) Haeme is the prosthetic group and it is non-protein part
Answer
A
Question. Which one of the following cyano complexes would exhibit the lowest value of paramagnetic behaviour?
(Atomic number of Cr= 24, Mn= 25, Fe= 26, Co= 27)
(a) [Co(CN)6]3-
(b) [Fe(CN)6]3-
(c) [Mn(CN)6]3-
(d) [Cr(CN)6]3-
Answer
A
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 strong ligand fields)
(c) d4 (in weak ligand field)
(d) d4 (in strong ligand field)
Answer
D
Question. I. K4[Fe(CN)6]
II. K3[Cr(CN)6]
III. K3[Co(CN)6]
IV. K2[Ni(CN)4]
Select the complexes which are diamagnetic.
(a) I, II and III
(b) II, III and IV
(c) I, III and IV
(d) I, II and IV
(e) II and IV
Answer
C
Question. How many unpaired electrons are present in the central metal ion of[CoCl4 ]2- ?
(a) 3
(b) 4
(c) 5
(d) 2
Answer
A
Question. What is the magnetic moment of K3[FeF6]?
(a) 5.91 BM
(b) 4.89 BM
(c) 3.87 BM
(d) 6.92 BM
Answer
A
Question. The most stable ion is
(a) [Fe(OH)5]3-
(b) [FeCl6 ]3-
(c) [Fe(CN)6]3-
(d) [Fe(H2O)6]3+
Answer
C
Question. In which of the following coordination entities the magnitude of Do (CFSE in octahedral field) will be maximum?
(a) [Co(CN)6]3–
(b) [Co(C2O4)3]3–
(c) [Co(H2O)6]3+
(d) [Co(NH3)6]3+
(At. No. Co = 27)
Answer
A
Question. The number of geometrical isomers for [Pt(NH3)2Cl2] is
(a) 3
(b) 4
(c) 1
(d) 2
Answer
D
Question. Which of the following is the correct order of increasing field strength of ligands to form coordination compounds?
(a) SCN– < F– < C2O42- < CN–
(b) SCN– < F– < CN– < C2O42–
(c) F– < SCN– < C2O42– < CN–
(d) CN– < C2O42– < SCN– < F–
Answer
A
Question. Aluminium chloride in acidified aqueous solution forms a complex ‘A’, in which hybridisation state of Al is ‘B’. What are ‘A’ and ‘B’, respectively ?
(a) [Al(H2O)6]3+, sp3d2
(b) [Al(H2O)4]3+, sp3
(c) [Al(H2O)4]3+, dsp2
(d) [Al(H2O)6]3+, d2sp3
Answer
A
Question. The d electron configurations of Cr2+, Mn2+, Fe2+ and Ni2+ are 3d4, 3d5, 3d6and 3d8 respectively. Which one of the following aqua complexes will exhibit the minimum aramagnetic behaviour?
(a) [Fe(H2O)6]2+
(b) [Ni(H2O)6]2+
(c) [Cr(H2O)6]2+
(d) [Mn(H2O)6]2+.
(At. No. Cr = 24, Mn = 25, Fe = 26, Ni = 28
Answer
B
Question. Which one of the following is an inner orbital complex as well as diamagnetic in behaviour?
(a) [Zn(NH3)6]2+
(b) [Cr(NH3)6]3+
(c) [Co(NH3)6]3+
(d) [Ni(NH3)6]2+
(Atomic number : Zn = 30, Cr = 24, Co = 27, Ni = 28)
Answer
C
Question. Which of the following complex ions is expected to absorb visible light?
(a) [Ti(en)2(NH3)2]4+
(b) [Cr(NH3)6]3+
(c) [Zn(NH3)6]2+
(d) [Sc(H2O)3(NH3)3]3+
[At. nos. Zn = 30, Sc = 21, Ti = 22, Cr = 24]
Answer
B
Question. Which of the following complexes exhibits the highest paramagnetic behaviour?
(a) [Co(ox)2(OH)2]–
(b) [Ti(NH3)6]3+
(c) [V(gly)2(OH)2(NH3)2]+
(d) [Fe(en)(bpy)(NH3)2]2+
where gly = glycine, en = ethylenediamine and bpy = bipyridyl moities. (At. nos. Ti = 22, V = 23, Fe = 26, Co = 27)
Answer
A
Question. Among [Ni(CO)4], [Ni(CN)4]2–, [NiCl4]2– species, the hybridisation states at the Ni atom are, respectively
(a) sp3, dsp2, dsp2
(b) sp3, dsp2, sp3
(c) sp3, sp3, dsp2
(d) dsp2, sp3, sp3.
[Atomic number of Ni = 28]
Answer
B
Question. In an octahedral structure, the pair of d orbitals involved in d2sp3 hybridisation is
(a) d x2−y2 ,dz2 ,
(b) dxz , d x2−y2
(c) d z2 ,d xz
(d) dxy , dyz
Answer
A
Question. The number of unpaired electrons in the complex ion [CoF6]3– is
(a) 2
(b) 3
(c) 4
(d) zero
(Atomic no. : Co = 27)
Answer
C
Question. The hybridization involved in complex [Ni(CN)4]2– is (At. No. Ni = 28)
(a) sp3
(b) d2sp2
(c) d2sp3
(d) dsp2
Answer
D
Question. Among the following complexes the one which shows zero crystal field stabilization energy (CFSE) is
(a) [Mn(H2O)6]3+ (b) [Fe(H2O)6]3+
(c) [Co(H2O)6]2+
(d) [Co(H2O)6]3+
Answer
B
Question. Atomic number of Cr and Fe are respectively 24 and 26, which of the following is paramagnetic with the spin of electron?
(a) [Cr(CO)6]
(b) [Fe(CO)5]
(c) [Fe(CN)6]4–
(d) [Cr(NH3)6]3+
Answer
D
Question. Which statement is incorrect?
(a) Ni(CO)4 – tetrahedral, paramagnetic
(b) [Ni(CN)4]2– – square planar, diamagnetic
(c) Ni(CO)4 – tetrahedral, diamagnetic
(d) [NiCl4]2– – tetrahedral, paramagnetic
Answer
A
Question. Iron carbonyl, Fe(CO)5 is
(a) tetranuclear
(b) mononuclear
(c) trinuclear
(d) dinuclear.
Answer
B
Question. An example of a sigma bonded organometallic compound is
(a) Grignard’s reagent
(b) ferrocene
(c) cobaltocene
(d) ruthenocene.
Answer
A
Question. Which of the following has longest C—O bond length? (Free C—O bond length in CO is 1.128 Å.)
(a) [Fe(CO)4]2–
(b) [Mn(CO)6]+
(c) Ni(CO)4
(d) [Co(CO)4]–
Answer
A
Question. Which of the following carbonyls will have the strongest C – O bond?
(a) Mn(CO)6 +
(b) Cr(CO)6
(c) V(CO)6 –
(d) Fe(CO)5
Answer
A
Question. Which of the following does not have a metal – carbon bond?
(a) Al(OC2H5)3
(b) C2H5MgBr
(c) K[Pt(C2H4)Cl3]
(d) Ni(CO)4
Answer
A
Question. Among the following which is not the p-bonded organometallic compound?
(a) K [PtCl3(h2 – C2H4)]
(b) Fe (h5 – C5H5)2
(c) Cr(h6 – C6H6)2
(d) (CH3)4Sn
Answer
D
Question. CN– is a 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.
Answer
B
Question. Considering H2O as a 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.
Answer
B
Question. Which of the following organometallic compounds is s and p-bonded?
(a) [Fe(h5 – C5H5)2]
(b) K[PtCl3(h2 – C2H4)]
(c) [Co(CO)5NH3]2+
(d) Fe(CH3)3
Answer
C
Question. Which of the following compounds formed by Cu2+ ions is most stable?
(a) Cu2+ + 4NH3 → [Cu(NH3)4]2+; Log K = 11.6
(b) Cu2+ + 4CN– → [Cu(CN)4]2–; Log K = 27.3
(c) Cu2+ + 2en → [Cu(en)2]2+; Log K = 15.4
(d) Cu2+ + 4H2O → [Cu(H2O)4]2+; Log K = 8.9
Answer
B
Question. The colour of the coordination compounds depends on the crystals field splitting. What will be the correct order of absorption of warleinth of light in the visible region. for the complenes [CO(NH3)6]3+; [CO(CN)0]3–;[CO(H2O)6]3+.
(a) [CO (CN)6]3– > [CO(NH3)6]3+ > [CO(H2O)6]3+
(b) [CO (NH3)6]3+ > [CO(H2O)6]3+ > [CO(CN)6]3–
(c) [CO (H2O)6]3+ > [CO(NH3)6]3+ > [CO(CN)6]3–
(d) [CO (CN)6]3– > [CO(NH3)6]3+ > [CO(H2O)6]3+
Answer
C
Question. When 0.1 mol COCl3 (NH3)5 is treated with excess of AgNO3; 0.2 mol of AgCl are obtained. The conductivity of solution will correspond to.
(a) 1 : 3 electrolyte
(b) 1 : 2 electrolyte
(c) 1 : 1 electrolyte
(d) 3 : 1 electrolyte
Answer
B
Question. Hypo is used in photography to
(a) reduce AgBr grains to metallic silver
(b) convert metallic silver to silver salt
(c) remove undecomposed silver bromide as a soluble complex
(d) remove reduced silver.
Answer
C
Question. The correct IUPAC name of [Pt(NH3)2 Cl2] is
(a) Diamminedichloridoplatinum (II)
(b) Diamminedichlorideplatinum (IV)
(c) Diamminedichlorideplatinum (0)
(d) Dimminedichlorideplatinum (IV)
Answer
A
Question. This stabilisation of coordination compounds due to chelation is called the chelate effect. Which of the following is the most stable complen species?
(a) [Fe (CO)5]
(b) [Fe(CN)6]3–
(c) [Fe(C2O4)3]3+
(d) [Fe(H2O)6]3+
Answer
C
Question. Indicate the complen ion which shows geometrical isomerism.
(a) [Cr(H2O)4 Cl2]+
(b) [Pt(NH3)3Cl]
(c) [Pt(NH3)6]3+
(d) [CO(CN)5(NC)]3–
Answer
A
Question. The CFSE for octahedral [CaCl6]4– is 18,000 cm–1. The CFSE for tetrahedral [COCl4]2– will be:
(a) 18,000 cm–1
(b) 16,000 cm–1
(c) 8,000 cm–1
(d) 20,000 cm–1
Answer
C
Question. Due to the presence of ambidentate ligands coordination compounds show isomerism. Palladium complens of the type [Pd (C6H5)2(SCN)2] and [Pd(C6H5)2 (NCS)2] are:
(a) Linkage isomers.
(b) Coordination isomers
(c) Ionisation isomers
(d) Geometrical isomers
Answer
A
Question. The compounds [CO(SO4)(NH3)5 Br and [CO(SO4) (NH3)5] Cl represent.
(a) Linkage isomerism
(b) Ionisation isomerism
(c) Coordination isomerism
(d) No isomerism
Answer
D
Question. Which of the following species is not impected to be a ligand?
(a) NO
(b) NH4+
(c) NH2CH2NH2
(d) CO
Answer
B
Question. What kind of isomerism exist between [Cr (H2O)6] Cl3 (violet) and [Cr(H2O)5Cl] Cl2 . H2O (greyish green)?
(a) Linkage isomerism
(b) Saluate isomerism
(c) Ionisation isomerism
(d) Coordination isomerism
Answer
B
Question. IUPAC name of [Pt(NH3)2Cl(NO2)] is:
(a) Platinum diaminechloritrite
(b) Chloronitrito-N-ammine platinum(II)
(c) Diamminechloridonitrite-N-platinum (II)
(d) Diamminechlornitrite-N-platinate(II)
Answer
C
Question. Atomic number of Mn, Fe and Co are 25, 26 and 27 respectively. Which of the following inner orbital octahedral complen ions are diamagnetic?
(a) [CO(NH3)6]3+
(b) [Mn(CN)6]3–
(c) [Fe(CN)6]4–
(d) [Fe(CN)6]3–
Answer
A,C
Question. Which of the following options are correct for [Fe(CN)6]3– complen?
(a) d2sp3 hybridisation
(b) sp3d2 hybridisation
(c) paramagnetic
(d) diamagnetic
Answer
A,C
Question. Identify the optically acive compounds from the following:
(a) [CO(en)3]3+
(b) trans [CO(en)2Cl2]+
(c) Cis [CO[en)2Cl2]+
(d) [Cr(NH3)5Cl]
Answer
A,C
Question. Match the complen ions given in column 1 with the hybridisation and number of unpaired electrons given in column 2 and assign the correct code.
Answer
B
Question. Match the complen species given in column 1 with the possible isomerism given in column 1 and assign the correct code.
Answer
D
Note: In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choice.
(a) Both assertion and reason are True, and reason is the correct explanation of the assertion.
(b) Both assertion and reason are True, but reason is not the correct explanation of the assertion.
(c) Assertion is True, but reason is False.
(d) Both assertion and reason are False.
Question. Assertion: Toxic metal ions are removed by the chelating ligands.
Reason: Chelate complens tend to be move stable.
Answer
A
Question. Assertion: [(Fe(CN)6]3– ion shows magnetic moment corresponding to two unpaired electrons.
Reason: Because it has d2sp3 type hybridisation.
Answer
D
Question. The coordination number of metal M in the complen [M(en) (C2O4) ClBr]– is
Answer
6
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