MCQ Questions for Class 12 Chemistry Chapter 9 Coordination Compounds with Answers

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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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