Adsorption -surface chemistry

Physisorption is an which thermic process?

• exothermic

• Endothermic

• Physical 

• Chemical

Which of the following is not a favourable condition for physical adsorption?

• high pressure

• negative ∆H

• higher critical temperature of adsorbate

• high temperature

The quantity of gas adsorbed per unit mass of the adsorbent,x is directly proportional to_______.

• (a) surface area covered by adsorbed molecule

• (b) surface area uncovered by gas molecules .

• (c) free gas molecules

  .

• (d) all of the above

The term ‘sorption’ stands for ____________.

• absorption

• adsorption

• both absorption and adsorption

• desorption

B.E.T theory was based on 

• Single layer  adsorption.

• Multilayer adsorption

• Double layer adsorption

• None of the above

The relation between the quantities of gas adsorbed to the pressure of the gas at_______temperature is called langmuir's adsorption isotherm.

• increase

• decrease

• constant

• None of the mentioned

________ adsorbs moisture from the desicates.

• Alumina gel

• Silica gel

• Monomer gel

• Biopolymer gel

chemisorption is takes place only between ​

​ ​ ​ ............. and .................

• adsorption and absorption

• Absorption and absorbate 

• Adsorption and adsorbate

• Adsorbent and adsorbate

Physisorption gas is ______________ in     

       nature.

• reverisable 

• Irreverisable

• Solid

• Liquid

The physisorption gas is accumulated on             

             _________ survive.

• liquid 

• Gas 

• Solid

• Liquid gas