1. Assertion (A): With the increase of temperature, the viscosity of glycerine increases.
2. Reason (R): Rise of temperature increases kinetic energy of molecules.
A
Both A and R are individually true and R is the correct explanation of A
B
Both A and R are individually true but R is not a correct explanation of A
C
A is true but R is false
D
A is false but R is true
Correct Answer: Option D
Explanation
1. Assertion (A) states that with the increase of temperature, the viscosity of glycerine increases. This is false. Viscosity in liquids, including glycerine, is caused by intermolecular forces. As temperature increases, molecules gain kinetic energy and overcome these forces more easily, leading to a decrease in viscosity (the liquid flows more easily).
2. Reason (R) states that rise of temperature increases kinetic energy of molecules. This is true. According to the kinetic theory of matter, the average kinetic energy of molecules is directly proportional to the absolute temperature.
3. Since A is false and R is true, the correct option is D.