Chemical Bonding and Molecular Structure MCQs

With the exception of noble gases, most elements do not exist independently. The force that holds atoms, ions, and molecules together is called a chemical bond. Atoms strive for stability by completing their octet. Oppositely charged ions are held together by an ionic bond, while in a covalent bond, electron pairs are shared between atoms. In a crystalline structure, molecules are held together by weak Van der Waals interactions.

MX6 is a molecule with octahedral geometry. How many X – M – X bonds are at 180°?

(a) four
(b) two
(c) three
(d) six

C-O bond length is minimum in

(a) CO₂
(b) CO₃^2-
(c) HCOO^–
(d) CO

Which one has a pyramidal shape?

(a) SO₃
(b) PCl₃
(c) CO₃²–
(d) NO₃–

Find the pair with sp² hybridisation of the central molecule

(a) NH₃and NO₂^–
(b) BF₃and NH₂^–
(c) BF₃and NO₂^–
(d) NH₂^–and H₂O

Molecules are held together in a crystal by

(a) hydrogen bond
(b) electrostatic attraction
(c) Van der Waal’s attraction
(d) dipole-dipole attraction

pπ – dπ bonding is present in which molecule

(a) SO₃^2-
(b) CO₃^2-
(c) NO₃^–
(d) BO₃^3-

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

Sp³d²hybridization is present in [Co(NH₃)₆³⁺], find its geometry

(a) octahedral geometry
(b) square planar geometry
(c) tetragonal geometry
(d) tetrahedral geometry

Which of the molecules does not have a permanent dipole moment?

(a) SO₃
(b) SO₂
(c) H2_S
(d) CS₂

Find the molecule with the maximum dipole moment

(a) CH₄
(b) NH₃
(c) CO₂
(d) NF₃