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MCQs on Class 11 Chemistry Chapter 4 Chemical Bonding and Molecular Structure

Questions
1 In which of the following molecule/ion all the bonds are not equal?
A XeF4
B BF4-
C C2H4
D SiF4

Answer:C2H4
2 Which molecule/ion out of the following does not contain unpaired electrons?
A N2+
B O2
C O22-
D B2

Answer:O22-
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3 Number of π bonds and σ bonds in the following structure is–

class-11-chemistry-chapter-4

A 6, 19
B 4, 20
C 5, 19
D 5, 20

Answer:5, 19
4 Which of the following species has tetrahedral geometry?
A BH4-
B NH2-
C CO32-
D H3O+

Answer:BH4-
5 In NO3-ion, the number of bond pairs and lone pairs of electrons on the nitrogen atom is
A 2, 2
B 3, 1
C 1, 3
D 4, 0

Answer:4, 0
6 In PO43- ion the formal charge on the oxygen atom of P–O bond is
A + 1
B – 1
C – 0.75
D + 0.75

Answer:– 1
7 Hydrogen bonds are formed in many compounds e.g., H2O, HF, NH3. The boiling point of such compounds depends to a large extent on the strength of hydrogen bond and the number of hydrogen bonds. The correct decreasing order of the boiling points of the above compounds is :
A HF > H2O > NH3
B H2O > HF > NH3
C NH3 > HF > H2O
D NH3 > H2O > HF

Answer:H2O > HF > NH3
8 The types of hybrid orbitals of nitrogen in NO2+, NO3- and NH4+respectively are expected to be
A sp, sp3 and sp2
B sp, sp2 and sp3
C sp2, sp and sp3
D sp2, sp3 and sp

Answer:sp, sp2 and sp3
9 Polarity in a molecule and hence the dipole moment depends primarily on electronegativity of the constituent atoms and shape of a molecule. Which of Does the following have the highest dipole moment?
A CO2
B HI
C H2O
D SO2

Answer:H2O
10 Isostructural species are those which have the same shape and hybridisation. Among the given species identify the isostructural pairs.
A [NF3 and BF3]
B [BF4- and NH4+]
C [BCl3 and BrCl3]
D [NH3 and NO3-]

Answer:[BF4- and NH4+]
11 Which one has a pyramidal shape?
A SO3
B PCl3
C CO32-
D NO3–

Answer:PCl3
12 pπ– dπ bonding is present in which molecule
A SO32-
B CO32-
C NO3–
D BO33-

Answer:SO32-
13 Which of the molecules does not have a permanent dipole moment?
A SO3
B SO2
C H2S
D CS2

Answer:CS2
14 The formal charge and P-O bond order in PO43- respectively are
A 0.6, -0.75
B -0.75, 1.25
C 1.0, -0.75
D 1.25, -3

Answer: -0.75, 1.25
15 Find the pair with sp2 hybridisation of the central molecule
A NH3 and NO2–
B BF3 and NH2–
C BF3 and NO2–
D NH2– and H2O

Answer:BF3 and NO2–
16 MX6 is a molecule with octahedral geometry. How many X – M – X bonds are at 180°?
A four
B two
C three
D six

Answer:three
17 Find the molecule with the maximum dipole moment
A CH4
B NH3
C CO2
D NF3

Answer:NH3
18 Sp3d2 hybridization is present in [Co(NH3)63+], find its geometry
A octahedral geometry
B square planar geometry
C tetragonal geometry
D tetrahedral geometry

Answer:octahedral geometry
19 Molecules are held together in a crystal by
A hydrogen bond
B electrostatic attraction
C Van der Waal’s attraction
D dipole-dipole attraction

Answer:Van der Waal’s attraction
20 C-O bond length is minimum in
A CO2
B CO32-
C HCOO–
D CO

Answer:CO

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