1. Which among the following chemical bond were described by Kossel and Lewis?
- 1) Ionic and Covalent Bond
- 2) Coordinate bond
- 3) Polar covalent bond
- 4) Metallic Bond
Answer: 1)
Explanation: Both Ionic and Covalent bond arise from the tendency of atoms to attain stable configuration of electrons.
2. Which among the following is not a property of Ionic bond?
- 1) Transfer of electrons
- 2) Sharing of electrons
- 3) Gain of electrons
- 4) Losing of electrons
Answer: 2)
Explanation: Ionic bond results from Losing, Transfer and Gain of electrons. But the transfer of electrons is a property of Covalent bond.
3. Which among the following formation is not an example of Covalent bond?
- 1) HF
- 2) CF₄
- 3) NH₃
- 4) LiF
Answer: 4)
Explanation: LiF (Lithium Fluoride) is an example of Ionic bond, as the formation takes place by transfer of electrons and not by sharing.
4. State whether the given statement is true or false “Ionic bonds are non-directional”.
Answer: 2)
Explanation: The ionic bond breaks up when dissolved in water and allow the charged particles to move freely.
5. If a bond is made up of a large number of organic compound, then the bond is termed as?
- 1) Dipolar bond
- 2) Covalent bond
- 3) Metallic bond
- 4) Ionic bond
Answer: 2)
Explanation: This is because they have the tendency to transfer electrons.
6. Which among the following is not an example of hydrogen bond?
- 1) CHCl₃
- 2) NH₃
- 3) Liquid HCl
- 4) H₂0
Answer: 3)
Explanation: There is no hydrogen bond in liquid HCl since the bond breaks up when dissolved in water.
7. Atoms undergo bonding in order to ___
- 1) Increase energy
- 2) Move freely
- 3) Lose stability
- 4) Attain stability
Answer: 4)
Explanation: Atoms undergo bonding to attain stable electronic configuration and to gain energy.
8. An atom differs from its ion in which among the following ?
- 1) Number of protons
- 2) Neutrons
- 3) Atomic number
- 4) Mass number
Answer: 1)
Explanation: When an atom loses or gains electrons its forms its corresponding ion, and hence it differs in proton number.
9. Which among the following is NOT both a molecule and a compound?
- 1) CO₂
- 2) NaCl
- 3) H₂O
- 4) C₆ H₁₂ O₆
Answer: 2)
Explanation: NaCl is a compound because it has ionic bond between Na and Cl. The other three options have both covalent bonds as well as ionic bonds, hence they can be termed as both molecules and compounds.
10. Bond energy and the corresponding bond length vary directly with each other.
Answer: 1)
Explanation: Smaller the bond energy, greater will be the bond length and vice versa and hence the two vary inversely with each other.
