Question

Chemisorption is unilayer and more stronger
(A) True
(B) False

Answer 1

Hint: Chemisorption and physisorption are the types of absorption. Adsorption is defined as the accumulation of the molecular species at the surface instead of the solid and liquid bulks.

Complete step by step solution:
Adsorption is usually a surface phenomenon. During this the molecules of the solvents get adsorbed on the surface of the solute. Adsorbent is the substance on which the process of adsorption takes place and the substance whose molecules get adsorbed at the surface is called adsorbate. Chemisorption has higher adsorption enthalpy nearly around 240 Kj/mol which is much more than the enthalpy of physisorption. As the temperature increases the amount of the chemisorption taking place increases. Chemical adsorption or chemisorption is monolayer and stronger as the force of attraction between the adsorbent and the adsorbate are the chemical forces of attraction or the chemical bond.

The correct answer is option (B) i.e. Chemisorption is unilayer and stronger – this statement is true.

Additional information:
Difference between physical and chemical adsorption is

physisorption	chemisorption
It is also known as physical adsorption.	It is also known as chemical adsorption.
The force behind the physical adsorption is van der Waals forces.	The force behind the chemical adsorption is chemical bonding.
Physisorption is reversible in nature.	Chemisorption is irreversible in nature
Physical adsorption is not specific in nature.	Chemical adsorption is very specific in nature.
Physical adsorption takes place at very low temperature.	Chemical adsorption takes place at high temperature.

Note: Chemisorption is also a surface phenomenon and it is exothermic in nature. It increases with the increase in the surface area of the adsorbent and both of the adsorptions are associated with the decreases in entropy.