Chemical Bonding and Molecular Structure NEET MCQ

Chemical bonding forms the cornerstone of our understanding of the molecular world. The way in which atoms connect to form molecules and the manner in which these molecules interact with each other are vital concepts for NEET aspirants. Not only does this topic offer fascinating insights into the world of molecules, but mastering it also significantly elevates your chances of acing the chemistry section in NEET. Let’s delve into a series of MCQs designed to test your grasp on the topic of Chemical Bonding and Molecular Structure.

1. Which of the following bonds is formed by the mutual sharing of electrons?

a) Covalent
b) Ionic
c) Metallic
d) Hydrogen

Answer:

a) Covalent

Explanation:

Covalent bonds are formed when atoms share electrons.

2. Which molecule has a triple bond?

a) O2
b) N2
c) H2
d) Cl2

Answer:

b) N2

Explanation:

Nitrogen molecules (N2) have a triple covalent bond between them.

3. What type of bond is formed between Na and Cl in NaCl?

a) Covalent
b) Ionic
c) Metallic
d) Hydrogen

Answer:

b) Ionic

Explanation:

Sodium loses an electron to chlorine, forming an ionic bond.

4. The shape of the CH4 molecule is:

a) Linear
b) Bent
c) Tetrahedral
d) Trigonal planar

Answer:

c) Tetrahedral

Explanation:

Methane (CH4) has a tetrahedral shape due to four equivalent C-H bonds.

5. Which molecule has a bent shape?

a) CO2
b) H2O
c) CH4
d) BCl3

Answer:

b) H2O

Explanation:

Water has a bent or V-shaped geometry due to two bond pairs and two lone pairs.

6. The bond angle in ammonia (NH3) is:

a) 90°
b) 104.5°
c) 107.5°
d) 120°

Answer:

c) 107.5°

Explanation:

Due to one lone pair and three bond pairs, the bond angle is slightly less than the tetrahedral angle.

7. Which of the following is NOT a property of ionic compounds?

a) High melting point
b) Soluble in water
c) Good conductors in solid state
d) Brittle

Answer:

c) Good conductors in solid state

Explanation:

Ionic compounds do not conduct electricity in the solid state but do so in the molten state.

8. The bond order of O2 is:

a) 1
b) 2
c) 2.5
d) 3

Answer:

b) 2

Explanation:

The bond order represents the number of chemical bonds between a pair of atoms. In O2, it is 2.

9. Which type of bond is present in diamond?

a) Single covalent
b) Double covalent
c) Triple covalent
d) Ionic

Answer:

a) Single covalent

Explanation:

Diamond has a giant covalent structure made up of single covalent bonds.

10. The hybridization of carbon in ethyne (C2H2) is:

a) sp
b) sp2
c) sp3
d) dsp2

Answer:

a) sp

Explanation:

Ethyne has a triple bond and the hybridization of carbon in it is sp.

11. Resonance structures are typically observed in:

a) Ionic compounds
b) Metallic compounds
c) Molecules where more than one valid Lewis structure can be drawn
d) Molecules with no double bonds

Answer:

c) Molecules where more than one valid Lewis structure can be drawn

Explanation:

Resonance is a concept where more than one Lewis structure can be drawn for a molecule without changing the positions of the atoms.

12. Which of the following is a coordinate covalent bond?

a) H-H bond in H2
b) O=O bond in O2
c) N≡N bond in N2
d) O-H bond in H3O+

Answer:

d) O-H bond in H3O+

Explanation:

In the hydronium ion (H3O+), one of the O-H bonds is a coordinate bond where oxygen donates both electrons.

13. Which molecule is linear?

a) Water (H2O)
b) Carbon dioxide (CO2)
c) Ammonia (NH3)
d) Methane (CH4)

Answer:

b) Carbon dioxide (CO2)

Explanation:

CO2 has a linear shape due to the arrangement of two double bonds on opposite sides of the carbon atom.

14. Which molecule is nonpolar?

a) Water (H2O)
b) Hydrogen fluoride (HF)
c) Methane (CH4)
d) Ammonia (NH3)

Answer:

c) Methane (CH4)

Explanation:

Methane is nonpolar because it has a symmetrical tetrahedral shape, making the dipoles cancel out.

15. Which element forms a diatomic molecule?

a) Neon
b) Argon
c) Chlorine
d) Sodium

Answer:

c) Chlorine

Explanation:

Chlorine exists as a diatomic molecule, Cl2, in its natural state.

16. The strength of a sigma (σ) bond as compared to a pi (π) bond is:

a) Weaker
b) Stronger
c) Equal
d) Cannot be compared

Answer:

b) Stronger

Explanation:

Sigma bonds are stronger than pi bonds because they have a greater degree of overlap of atomic orbitals.

17. Which of the following does not exhibit resonance?

a) O3
b) SO3
c) CO2
d) C6H6

Answer:

c) CO2

Explanation:

CO2 has a linear structure with no alternative valid Lewis structures.

18. The concept that explains the partial positive and partial negative charges in a molecule is called:

a) Ionization
b) Electro negativity
c) Resonance
d) Dipole moment

Answer:

d) Dipole moment

Explanation:

The dipole moment is a measure of the separation of positive and negative charges in a molecule.

19. Which of the following elements can expand its octet?

a) Carbon
b) Oxygen
c) Sulfur
d) Nitrogen

Answer:

c) Sulfur

Explanation:

Third period elements like sulfur can expand their octet due to the availability of d orbitals.

20. The type of hybridization in PCl5 is:

a) sp2
b) sp3
c) sp3d
d) sp3d2

Answer:

c) sp3d

Explanation:

PCl5 has a trigonal bipyramidal structure, which requires sp3d hybridization.

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