Question

(55)
The rate of diffusion decreases:
(A) With increase in temperature
(C) With decrease in temperature
(B) With increase in kinetic energy of molecules
(D) No effect of temperature
(56)
During evaporation, particles of a liquid change into vapours:
(A) only from the surface
(B) only from the bulk
(C) From both surface and bulk
(D) Neither from surface nor from bulk
(57)
Which of the following has more heat content?
(A) 10 g of ice at 0°C
(C) Both have same heat content
(B) 10 g of water at 0°C
(D) Their heat content cannot be compared​

Answer 1

Answer:

55) Option C - With decrease in temperature.

Decrease in temperature, decrease Kinetic energy and therefore reduces diffusion.

56) Option C- From both surface and bulk.

Intially when the evaporation starts, it's more a surface phenomenon. However as the process continues, the evaporation involves both surface and bulk.

Answer 2

55) (C) With decrease in temperature

56) (c)From both surface and bulk