Q15 of 47 Page 1

Write three differences between physisorption and chemisorption.

The three differences between physisorption and chemisorption are:


Physisorption Chemisorption


1. It arises because of van der Waals’ forces 1. It is caused by chemical bond formation


2. It is reversible in nature 2. It is irreversible in nature


3. Enthalpy of adsorption is low (20-40 kJ/mol) in this case 3. Enthalpy of adsorption is high (80-240 kJ/mol) in this case


More from this chapter

All 47 →
12

Define the following terms:

(a) Polysaccharides


(b) Nucleotides


 14

(a) What type of Stoichiometric defect is shown by NaCl and why?

(b) Calculate the efficiency of packing in case of a metal crystal for FCC unit cell.


 19

Using Valence Bond theory, predict the hybridisation and magnetic character of the following:

(a) [CoF6]3-


(b) [Ni(CN)4]2-


 23

Differentiate between the following:

(a) Antiseptics and Disinfectants


(b) Antacids and Antihistamines


(c) Soaps and Detergents