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MCQ Questions Class 12 Coordination Compounds with Answers - Set - 3
Question 1:
The number of unpaired electrons in the square planar [Pt(CN)4 ]2- ion is
(a) 2
(b) 1
(c) 0
(d) 3
Correct Answer – (C)
Question 2:
[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
Correct Answer – (D)
Question 3:
Which of the following shell, form only an outer octahedral complex ?
(a) d4
(b) d8
(c) d6
(d) None of these
Correct Answer – (B)
Question 4:
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
Correct Answer – (D)
Question 5:
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
Correct Answer – (A)
MCQ Questions Class 12 Coordination Compounds With Answers
Question 6:
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
Correct Answer – (B)
Question 7:
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
Correct Answer – (B)
Question 8:
An octahedral complex is fom1ed when hybrid orbitals of the following type are involved
(a) sp3
(b) dsp2
(c) d2sp3
(d) sp2d2
Correct Answer – (C)
Question 9:
In which of the following octahedral complexes of Co (atomic number 27) will be magnitude of Δo be the hlghest?
(a) [Co(CN)6]3-
(b) [Co(C2O4)3]3-
(c) [Co(H2O)6]3+
(d) [Co(NH3)6]3+
Correct Answer – (A)
Question 10:
Which complex compound possesses sp3 d2 hybridisation?
(a) [Fe(NH3)6 ]3+
(b) [Fe(CN)6 ]4-
(c) [Fe(CN)6 ]3-
(d) [Fe(Cl)6 ]3-
Correct Answer – (D)
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