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Question

At the same temperature and pressure, which of the following gas will be adsorbed in more proportion?
(A) Cl​​​​​2
(B) N​​​​​​2
(C) H​​​​​​2
(D) NH​​​3
Ans: (D) 
Why does NH​​​​​3  get adsorbed more amongst the following?


Solution

Adsorption is inversely proportional to the critical temperature of a gas. More the critical temperature, lesser is the adsorption. NH3 gas has hydrogen bonding while N2 has only weak vander walls forces. Since the forces of attraction are more in NH3, so it liquifies easily and hence its critical temperature is low. Therfore, it adorbs easily on the surface of the adsorbent. Also in case of cl2 and h2

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