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Free download in PDF Chemical Bonding Short Questions & Answers for competitive exams. These short objective type questions with answers are very important for competitive exams like IIT-JEE, NEET, AIIMS, JIPMER etc. These short solved questions or quizzes are provided by Gkseries.
41
Which of the following species has maximum number of lone-pair of electrons on the central atom ?
[A]
XeF2
[B]
H3O+
[C]
XeF4
[D]
XeF6
42
PCl5 is highly unstable and in solid state it exists as into [PCl4]+ and [PCl6]- ions.
The geometry of [PCl6]- is
[A]
octahedral
[B]
tetrahedral
[C]
square pyramidal
[D]
square planar
43
In an octahedral structure, the pair of d orbitals involved in d2sp3-hybridisation is
[A]
dx2−y2, dz2
[B]
dxy, dx2−y2
[C]
dz2, dxz
[D]
dxy, dyz
44
Which of the following is isoelectronic ?
[A]
CO2, NO2
[B]
NO−2, CO2
[C]
CN−, CO
[D]
SO2, CO2
45
The dielectric constant of H2O is 80. The electrostatic force of attraction between Na+ and Cl- will be
[A]
reduced to 1/40 in water than in air
[B]
reduced to 1/80 in water than in air
[C]
will be increased to 80 in water than in air
[D]
will remain unchanged
Answer: reduced to 1/80 in water than in air
46
The correct order of C-O bond length among CO, CO2−3, CO2 is
[A]
CO2 < CO2−3< CO
[B]
CO = CO2 < CO2−3
[C]
CO2−3< CO2 < CO
[D]
CO < CO2 < CO2−3
47
In which one of the following molecules, the central atom said to adopt sp2 hybridisation ?
[A]
BeF2
[B]
BF3
[C]
C2H2
[D]
NH3
48
In which of the following pairs, the two species are isostructural ?
[A]
SF4 and XeF4
[B]
SO2−3 and NO−3
[C]
BF3 NF3
[D]
BrO−3 and XeO3
49
In BrF3 molecule, the lone pairs occupy equatorial positions to minimise :
[A]
lone pair-bond pair repulsion
[B]
bond pair-bond pair repulsion
[C]
lone pair-lone pair repulsion and lone pair-bond pair repulsion
[D]
lone pair-lone pair repulsion
Answer: lone pair-lone pair repulsion
50
In which of the following species the central atom has the type of hybridisation which is not the same as that present in the other three ?
[A]
SF4
[B]
I−3
[C]
SbCl2−5
[D]
PCl5
51
In which of the following molecules are all the bonds not equal ?
[A]
ClF3
[B]
BF3
[C]
AlF3
[D]
NF3
52
Which of the following is not isostructural with SiCl4?
[A]
SCl4
[B]
SO42-
[C]
PO43-
[D]
NH4+
53
Which one of the following is not paramagnetic ?
[A]
NO
[B]
N+2
[C]
CO
[D]
O−2
54
Which of the following two are isostructural?
[A]
XeF2, and IF2-
[B]
NH3, and BF3
[C]
CO32-, and SO32-
[D]
PCl5, and ICl5
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