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

(1) In which of the following molecule/ion all the bonds are not equal?

[A] XeF₄

[B] BF^4-

[C] C₂H₄

[D] SiF₄

Answer: C₂H₄

(2) Which molecule/ion out of the following does not contain unpaired electrons?

[A] N²⁺

[B] O₂

[C] O₂^2-

[D] B₂

Answer: O₂^2-

(3) Number of π bonds and σ bonds in the following structure is–

[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] BH^4-

[B] NH^2-

[C] CO₃^2-

[D] H₃O⁺

Answer: BH^4-

(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 PO4^3- 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⁺, NO^3-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] [BF^4- and NH⁴⁺]

[C] [BCl₃ and BrCl₃]

[D] [NH₃ and NO^3-]

Answer: [BF^4- and NH⁴⁺]

(11) Which one has a pyramidal shape?

[A] SO₃

[B] PCl₃

[C] CO₃^2-

[D] NO₃^–

Answer: PCl₃

(12) pπ– dπ bonding is present in which molecule

[A] SO₃^2-

[B] CO₃^2-

[C] NO₃^–

[D] BO₃^3-

Answer: SO₃^2-

(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 PO₄^3- 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 sp²hybridisation 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] CO₃^2-

[C] HCOO^–

[D] CO

Answer: CO

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