Question

Rate of physical adsorption increases with:
A.Decrease in surface area
B.Decrease in temperature
C.Decrease in pressure
D.Increase in temperature

Answer 1

Hint: On increasing temperature, kinetic energy of molecules increases due to increase in random movement of molecules in fluids and increase in vibrations in solids. This may lead to more number of collisions of the molecules of the substance and with other surfaces as well.

Complete step by step answer:
On increasing temperature, kinetic energy of molecules increases due to increase in random movement of molecules in fluids and increase in vibrations in solids. This may lead to more number of collisions of the molecules of the substance and with other surfaces as well.
And hence option D is the correct answer.

Additional Information:
Adsorption is the phenomenon of collection of a substance (mostly liquid or gas) on the surface of the other substance (mostly solid) due to physical or chemical bonds.
Following are the factors affecting adsorption:
Nature of adsorbent
Surface area: more the surface area, more the adsorption.
Pressure: more the pressure, more the adsorption.

Note:
It is observed that physical adsorption is an endothermic process that is its rate increases on increase in temperature. But in case of chemical adsorption, initially it increases with increase in temperature up to reaching the activation energy level, after that it starts decreasing due to breaking of bonds.