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Q.

Physical adsorption is accompanied by ____ ?

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a

The value of T∆S is negative

b

Decrease in entropy of the system

c

All the above

d

Decrease in enthalpy

answer is D.

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Detailed Solution

Gas molecules loose their freedom and get attached on the surface of the adsorbent during adsorption. Therefore, entropy decreases.

During adsorption a lot of gas molecules are attracted by the surface of the adsorbent. Thus, energy is released and so enthalpy of the the system decreases.

Since entropy decreases, ∆S = negative and so T∆S will also be negative.

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