Adsorption increases when_________
A. Temperature increases
B. Temperature decreases
C. Temperature remain constant
D. None of these

Hint: To answer this question we have to know about adsorption. Adsorption takes place between the adsorbate and adsorbent due to physical or chemical bonding. Physical adsorption has weak vanderwaal’s force or hydrogen bonding.

Complete Step by Step Solution:
In the method of adsorption, the adsorption takes place between the adsorbate and adsorbent due to weak hydrogen bonding or van der waal’s force or chemical bond.

Adsorption is inversely proportional to temperature. It increases with decrease in temperature because as the temperature increases the bond vibration increases so, the adsorption decreases.
Thus the correct option is B.

Additional information:
The extent of adsorption depends on several factors like:
- The extent of adsorption of a gas on a solid substance depends on the nature of the gas.
- For example, easily liquefiable gases are more readily adsorbed than gases that do not liquefy easily.
- The extent of adsorption of a gas on a solid depends on the pressure of the gas.
- With increase in the pressure, the extent of the adsorption increases.
- The extent of adsorption of a gas on a solid depends on the nature and surface area of the adsorbent. With the increase in the surface area of the adsorbent the extent of adsorption also increases.

Note: The process of holding gas, liquid or solid molecules on solid is called as adsorption. There are two types of adsorption present. One of these is physical adsorption and another one is chemical adsorption. All the colloids undergoes adsorption.