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Physical adsorption is accompanied by ____ ?

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Decrease in entropy of the system

Decrease in enthalpy

The value of $T ∆ S$ is negative

All the above

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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