Intermolecular Forces and Melting Point MCQs

1. A microscopic property is _______

(A) Reactivity

(B) Kinetic energy

(C) Inter-molecular force

(D) Boiling point

2. Not a necessary condition for the formation of intra-molecular hydrogen bonding is ___________

(A) A 5 or 6-membered ring must be formed

(B) The ring should be planar

(C) There must be always the minimum strain during the ring closure

(D) There must be always the maximum strain during the ring closure

3. Why is O-nitrophenol more volatile than p-nitrophenol?

(A) Because of Inter-molecular hydrogen bonding in O-nitrophenol

(B) Because of the Electromeric effect

(C) Because of the Intra-molecular hydrogen bonding in O-nitrophenol

(D) Because of the Inductive effect

4. The melting point of mercury is _______

(A) 357°C

(B) 0°C

(C) 100°C

(D) 39°C

5. Which of the following is the correct statement?

(A) None of these

(B) When we transform a solid into a liquid it is called melting and its reverse process is called freezing

(C) When we transform a liquid into solid it is called melting and its reverse process is called the freezing

(D) When we transform a solid into a liquid it is called freezing and its reverse process is called melting

6. Which of the following confirms the purity of the compound?

(A) Its melting point and boiling point

(B) Chromatographic technique

(C) Spectroscopy

(D) All of these

7. The molar heat of fusion (kJ/mol) of water is _______

(A) 1.3

(B) 0.84

(C) 7.61

(D) 6.01

8. The consequence of hydrogen bonding is _______

(A) Abnormal boiling point

(B) All of these

(C) Azeotropic behavior

(D) Solubility and Viscosity

9. The Hydrogen bonding is always maximum in which of the following?

(A) Diethyl ether

(B) Ethyl chloride

(C) Ethanol

(D) Triethylamine

10. When the solid and liquid phase are in equilibrium, what happens to the temperature?

(A) Decreases gradually

(B) Remains constant

(C) Increases gradually

(D) None of these

11. _________ has always the highest bond dissociation energy

(A) Dipole-dipole

(B) Van der Waals forces

(C) Hydrogen bond

(D) Covalent bond

12. The strength of Van der Waals forces depends upon which of the following?

(A) All of these

(B) Molecular structure

(C) Number of electrons present in the molecule

(D) Size of the molecule

13. The Molar heat of fusion is defined as the energy required to melt _________

(A) One gram of solid

(B) One mole of solid

(C) One kilogram of solid

(D) Ten moles of solid

14. Which of the following is the melting point of ice?

(A) 4°C

(B) 100°C

(C) 4°C

(D) 0°C

15. Which of the following is the incorrect statement?

(A) Each pure solid crystalline substance has always a characteristic and has its unique melting point

(B) Two different pure substances always have their same melting points

(C) The impure sample of the substance always has a different melting point

(D) The melting point always serves as a criterion for the purity of a solid substance

16. What is the temperature at which solid and liquid coexist in equilibrium called?

(A) Freezing point of liquid

(B) Melting point of liquid

(C) All of these

(D) Freezing point of solid