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Coordination Compounds Class 12 MCQs Questions with Answers
Question 1.
The oxidation number of Cr in a [Cr(NH3)2F4]– complex is
(a) II
(b) III
(c) IV
(d) VI.
Answer
Answer: (b) III
Question 2.
The formula of potassium dicyanobis (oxalato) nickelate (II) is
(a) K4[Ni(CN)(Ox)2]
(b) K3[Ni2 (CN)2 (Ox)2]
(c) K4[Ni(CN)2(Ox)2]
(d) K2[Ni(CN)2(Ox)2]
Answer
Answer: (c) K4[Ni(CN)2(Ox)2]
Question 3.
The name of [Co(NH2)3 (NO2)3] is
(a) T.initrotriamminecobalt(III)
(b) Trinjtrotriamminecobalt(II)
(c) Trirtitrotriamjninecobalt (III) ion
(d) TrinitrotnamminecobaHate (III).
Answer
Answer: (a) T.initrotriamminecobalt(III)
Question 4.
The co-ordination number of cobalt in the complex [Co(en)2Br2]Cl2 is
(a) 4
(b) 6
(c) 5
(d) 2.
Answer
Answer: (b) 6
Question 5.
The number of halide ions in [Pt(NH3)3Cl3Br]Cl will be
(a) 4
(b) 3
(c) 2
(d) 1.
Answer
Answer: (d) 1.
Question 6.
K3[Al(C2O4)3] is called
(a) Potassium alumino oxalate
(b) Potassium aluminium (III) trioxalate
(c) Potassium trioxalato aluminate (III)
(d) Potassium tris (oxalato) aluminium.
Answer
Answer: (c) Potassium trioxalato aluminate (III)
Question 7.
The cation that does not form an ammine complex with excess of ammonia is
(a) Ag+
(b) Al3+
(c) Cu2+
(d) Cd2+
Answer
Answer: (b) Al3+
Question 8.
EDTA combines with cations to form
(a) chelates
(b) clathrates
(c) non-stoichiometric compounds
(d) polymers.
Answer
Answer: (a) chelates
Question 9.
One among the following is an example of hexadentate ligands
(a) 2,2-bipyridyl
(b) ethylenediammine tetra acetate ion
(c) dimethyl glyoxime
(d) Tetracarbonyl nickel.
Answer
Answer: (b) ethylenediammine tetra acetate ion
Question 10.
One among the following is not an organometallic compound
(a) Trimethylboron
(b) Trimethyl aluminium
(c) Trimethoxy titanium chloride
(d) Tetracarbonyl nickel.
Answer
Answer: (c) Trimethoxy titanium chloride
Question 11.
The correct structural formulae of Zeise’s salt is
(a) K+ [PtCl3(C2H4)]–
(b) K+ [PtCl2-η²-(C2H4)]Cl–
(c) K2 [PtCl3-η²-C2H4)]
(d) K+ [PtCl3-η²-(C2H4)]–.
Answer
Answer: (d) K+ [PtCl3-η²-(C2H4)]–.
Question 12.
Amongst Ni (CO)4, [Ni(CN)4]2- and NiCl42-
(a) Ni(CO)4 and NiCl42- are diamagnetic and [Ni(CN)4]2- is paramagnetic
(b) NiCl42- arrd [Ni(CN)4]2- are diamagnetic and Ni(CO)4 is paramagnetic.
(c) Ni(CO)4 and [Ni(CN)4]2- are diamagnetic and [NiCl4]2- is paramagnetic.
(d) Ni(CO)4 is diamagnetic and [NiCl4]2- and [Ni(CN)4]2- are paramagnetic.
Answer
Answer: (c) Ni(CO)4 and [Ni(CN)4]2- are diamagnetic and [NiCl4]2- is paramagnetic.
Question 13.
Which of the following coordination compounds can exhibit coordination somerism?
(a) [Co(en)2Cl2]Br
(b) [CO(NH3)6], [Cr(CN)6]
(c) [Co(en)3]Cl3
(d) [CO(NH3)5NO2]Cl2
Answer
Answer: (b) [CO(NH3)6], [Cr(CN)6]
Question 14.
Which of the following compounds can exhibit linkage isomerism?
(a) [Co(en)3]Cl3
(b) [Co(en)2Cl2]Cl
(c) [Co(en)2NO2Cl]Br
(d) [Co(NH3)5Cl]Br2.
Answer
Answer: (c) [Co(en)2NO2Cl]Br
Question 15.
Which of the following ligands is a bidentate ligand?
(a) Py
(b) Bipy
(c) dien
(d) EDTA.
Answer
Answer: (b) Bipy
Question 16.
Which of the following ligands is a tridentate ligand?
(a) DMG
(b) Bipy
(c) acac
(d) dien.
Answer
Answer: (d) dien.
Question 17.
In Ni (CO)4, the nickel atom is ……… hybridised
(a) sp²
(b) sp³
(c) dsp²
(d) sp³d.
Answer
Answer: (b) sp³
Question 18.
Ziegler-Natta catalyst is TiCl3 dissolved in
(a) Triethylaluminium
(b) Ether
(c). Water
(d) Ammonia.
Answer
Answer: (a) Triethylaluminium
Question 19.
Which of the following compounds can show optical isomerism?
(a) trans-[Co(en)2Cl2]Br
(b) [Co(en)3]Cl3
(c) trans-[Co(NH3)4Cl2]Cl
(d) [Co(NH3)5Cl]Cl2.
Answer
Answer: (b) [Co(en)3]Cl3
Question 20.
How many ions are produced from [Co(NH3)5Cl]Cl2 in solution,
(a) 3
(b) 4
(c) 2
(d) 5
Answer
Answer: (a) 3
Question 21.
[Fe(NO2)3 Cl3) and [Fe (O-NO)3 Cl3] show
(a) linkage isomerism
(b) geometrical isomerism
(c) optical isomerism
(d) none of these.
Answer
Answer: (a) linkage isomerism
Question 22.
Which one of the following is expected to exihibit optical isomerism (en = ethylene diammine).
(a) cis-[Pt (NH3)2Cl2)
(b) cis-[Co(en)2Cl2]
(c) trans-[Co(en)2 Cl2]
(d) trans-[Pt (NH3)2Cl2]
Answer
Answer: (b) cis-[Co(en)2Cl2]
Question 23.
Which one of the following is an inner orbital complex as well as diamagnetic in behaviour?
(a) [Zn(NH3)6]3+
(b) [NI(NH3)2]2+
(c) [Cr(NH3)6]3+
(d) [Co(NH3)6]3+
Answer
Answer: (d) [Co(NH3)6]3+
Question 24.
Which of the following cyano complexes would exihibit the lowest value of paramagnetic character?
(a) [Cr(CN)6]3-
(b) [Mn(CN)6]3-
(c) [Fe(CN)6]3-
(d) [Co(CN)6]3-
Answer
Answer: (d) [Co(CN)6]3-
Question 25.
Which of the following compounds shows optical isomerism?
(a) [Cu(NH3)4]2+
(b) [ZNCl4]2-
(c) [Cr(C2O4)3]3-
(d) [Co(CN)6]3-
Answer
Answer: (c) [Cr(C2O4)3]3-
Question 26.
The spin magnetic moment of cobalt in the compound Hg [Co(SCN)4]
(a) √3
(b) √8
(c) \(\sqrt {15}\)
(d) \(\sqrt {24}\)
Answer
Answer: (c) \(\sqrt {15}\)
Question 27.
The diamagnetic species is
(a) [Ni(NH)4]2-
(b) [NICl4]2-
(c) [CoCl4]2-
(d) [CoF6]2-
Answer
Answer: (a) [Ni(NH)4]2-
Question 28.
Which of the following has the largest number of isomers?
(a) [RU(NH3)4Cl2]+
(b) [CO(NH3)5Cl2]2+
(c) [Ir (PR3) H(CO)]2+
(d) [Co(en)2Cl2]+
Answer
Answer: (d) [Co(en)2Cl2]+
Question 29.
Considering H2O as a weak field ligand, the numbers of unpaired electrons in [Mn(H2O)6]2+ will be [At. No. of Mn = 25]
(a) 3
(b) 5
(c) 2
(d) 4
Answer
Answer: (b) 5
Question 30.
EDTA has coordination number.
(a) 3
(b) 4
(c) 5
(d) 6
Answer
Answer: (a) 3
Question 31.
How many isomers are possible in [Co(en)2 Cl2]?
(a) 2
(b) 4
(c) 6
(d) 1
Answer
Answer: (d) 1
Question 32.
The oxidation state of Cr in lCr(NH3)4Cl2]+ is
(a) + 3
(b) + 2
(c) + 1
(d) 0
Answer
Answer: (b) + 2
Question 33.
Which type of isomerism is shown by, the octahedral complex CO(NH3)4 Br2 Cl?
(a) Geometrical and ionisation
(b) Geometrical and optical
(c) Optical and ionisation
(d) Geometrical only
Answer
Answer: (a) Geometrical and ionisation
Question 34.
Which one of the following is an outer orbital complex?
(a) [Fe(CN)6]4-
(b) [Mn(CN)6]4-
(c) [Go (NH3)6]3+
(d) [Ni (NH3)6]4+
Answer
Answer: (d) [Ni (NH3)6]4+
Question 35.
In the spectrochemical series, the magnitude of the crystal field splitting is maximum for which ion?
(a) Cl–
(b) F–
(c) NO2
(d) CN–
Answer
Answer: (d) CN–
Question 36.
The complex used as an anticancer agent is
(a) mer-[Co(NH3)2 Cl3]
(b) cis-[PtCl2 (NH3)2]
(c) cis-K2[PtCl2Br2]
(d) Na2CoCl4
Answer
Answer: (b) cis-[PtCl2 (NH3)2]
Question 37.
Ammonia forms the complex ion [Cu(NH3)4]2+ with copper ions in alkaline solutions, but not in acidic solutions. What is the reason for it?
(a) In acidic solutions, protons coordinate with ammonia molecules forming NH4+ ions and NH3 molecules are not available.
(b) In alkaline solutions insoluble Cu(OH)2 is precipitated which Is soluble in excess of any alkali.
(c) Copper hydroxide is an amphoteric substance.
(d) In acidic solutions, hydration protects copper ions.
Answer
Answer: (a) In acidic solutions, protons coordinate with ammonia molecules forming NH4+ ions and NH3 molecules are not available.
Question 38.
One mole of complex compound Co (NH3)5Cl3 gives 3 moles of ions on dissolution in water. One mole of the same complex reacts with two moles of AgNO3 solution to yield two moles of AgCl (s). The structure of the complex is
(a) [Co(NH3)3Cl3] 2NH3
(b) [CO(NH3)4Cl2] Cl NH3
(c) [CO(NH3)4Cl]Cl2.NH3
(d) [CO(NH3)5Cl]Cl2
Answer
Answer: (d) [CO(NH3)5Cl]Cl2
Question 39.
The correct order for the wavelength of absorption in the visible regionis
(a) [Ni(NO2)6]4- < [Ni (NH3)6]2+ < [Ni (H2O)6]2+
(b) [Ni(NO2)6]4- < [Ni (H2O)6]2+ < [Ni (H3)6]2+
(c) [Ni(H2O)6]2+ < [Ni (NH3)6]2+ < [Ni (NO2)6]4+
(d) [Ni(H3)6]2+ < [Ni (H2O)6]2+ < [Ni (NO2)6]4-
Answer
Answer: (a) [Ni(NO2)6]4- < [Ni (NH3)6]2+ < [Ni (H2O)6]2+
Question 40.
Which of the following statements is incorrect?
(a) in K3[Fe(CN)6], the ligand has satisfied only the secondary valency of ferric ion.
(b) In K3[Fe(CN)6], the ligand has satisfied both the primary and secondary valence of ferric ion.
(c) In K4 [Fe(CN)6] the ligand has satisfied both the primary and secondary valencies of ferrous ion.
(d) In [Cu(NH3)4]SO4, the ligand has satisfied only the secondary valency of copper.
Answer
Answer: (a) in K3[Fe(CN)6], the ligand has satisfied only the secondary valency of ferric ion.
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