Question

Statement-1 : The enthalpy of physisorption is greater than
chemisorption.
Statement-2 : Molecules of adsorbate and adsorbent are
held by van der Waal’s forces in physisorption and by
chemical bonds in chemisorption.

Answer 1

The first statement is false and second statement is true.

Explanation:

The first statement is incorrect.

• Because in physisorption there are only Van der waal's forces whereas in chemisorption the the forces are chemical which are strong forces as compared to Van der waal's forces.
• As the forces are strong than the heat evolved will be more in chemisorption.

• The second statement is true.

• Molecules of adsorbate and adsorbent are  held by van der Waal’s forces in physisorption and by chemical bonds in chemisorption which is true as mentioned in the above statement.

Hence the first statement is wrong and second statement is true.