INTRODUCTION - Chapter 5 - Surface Chemistry - Intext Solutions - Ncert Solutions class 12 - Chemistry

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Question 5.1:

Write any two characteristics of Chemisorption.

Answer:

1. Chemisorption is highly specific in nature. It occurs only if there is a possibility of chemical bonding between the adsorbent and the adsorbate.

2. Like physisorption, chemisorption also increases with an increase in the surface area of the adsorbent.

Question 5.2:

Why does physisorption decrease with the increase of temperature?

Answer:

Physisorption is exothermic in nature. Therefore, in accordance with Le-Chateliere’s principle, it decreases with an increase in temperature. This means that physisorption occurs more readily at a lower temperature.

Question 5.3:

Why are powdered substances more effective adsorbents than their crystalline forms?

Answer:

Powdered substances are more effective adsorbents than their crystalline forms because when a substance is powdered, its surface area increases and physisorption is directly proportional to the surface area of the adsorbent.