QUESTIONS - CHEMICAL BONDING

8. Chemical Bonding 

1. What type of bond is formed between two atoms in a nitrogen (N2) molecule ?

Ans: Triple bond

2. Which type of bond is formed between two atoms in a oxygen (O2) molecule ?

Ans: Double bond

3. Give an example for ionic bond. (OR)

Give an example for ionic compounds.

Ans: NaCl, MgO

4. What is sigma (σ) bond ? (OR)

How a sigma (σ) bond is formed ?

Ans: The overlap of orbitals along the inter-nuclear axis giving a sigma (σ) bond.

5. What is pi (π) bond ? (OR)

How a pi (π) bond is formed ?

Ans: The overlap of orbitals side wise or laterally giving a pi (π) bond.

6. Who proposed the ionic bond ?

Ans: Kossel

7. Which type of bond is formed when electrons are transferred from one atom to another?

Ans: Ionic bond

8. What is the bond angle in BeCl2 ?

Ans: 180°

9. What is the shape of BeCl2 ?

Ans: Linear

10. What is the bond angle in BF3 ?

Ans: 120°

11. What is the shape of BF3 ?

Ans: Trigonal-planar

12. Who proposed the hybridisation of atomic orbitals ?

Ans: Linus pauling

13. Who proposed the 'valence bond theory' ?

Ans: Linus Pauling

14. What are the forces present in an ionic bond ?

Ans: Electrostatic forces of attraction

1. List the factors that determine the type of bond that will be formed between two atoms?

Ans: 1. The strength of attraction or repulsion between atoms.

2. Electrons in valence shell (valence electrons) or valence of an atom.

2. What is Ionic bond?

Ans: Ionic bond: Ionic bond is formed between atoms of two dissimilar elements due to transfer of electrons from the atom of one element to the other.

3. What is a chemical bond ?

Ans: The force between any two atoms or a group of atoms that results in the formation of a stable entity is called chemical bond.

4. Define Octet rule.

Ans: Octet rule: “The atoms of elements tend to undergo chemical changes that help to leave their atoms with eight outer-shell electrons.” This is called Octet rule.

5. Write the names of any two compounds which have ionic bond.

Ans: 1) NaCl 2) MgCl2

6. Define valence electrons.

Ans: Valence electrons: The electrons present in the outermost orbital of an atom are valence electrons.

7. What is the main failure of the Valence Shell Electron Pair Repulsion Theory (VSEPRT) ?

Ans: Valence Shell Electron Pair Repulsion Theory (VSEPRT) mainly fails in explaining the strengths of the bonds.

8. What is hybridisation ?

Ans: Hybridisation: Hybridisation is a phenomenon of intermixing of atomic orbitals of almost equal energy which are present in the outer shells of the atom and their reshuffling or redistribution into the same number of orbitals but with equal properties like energy and shape.

9. How is a cation formed ?

Ans: A cation is formed when an atom loses electrons.

10. How is an anion formed ?

Ans: An anion is formed when an atom gaining electrons.

11. What is an ionic linkage ?

Ans: When two oppositely charged ions are engaged in a bond, it is known as ionic linkage.