InterviewSolution
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InterviewSolution
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Which adsorption takes place at low temperature?A. `DeltaH gt 0 and Delta S lt0`B. `DeltaHlt 0 and DeltaSlt0`C. `DeltaHgt0 and DeltaS gt0`D. `DeltaHlt0 and DeltaS gt 0` |
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Answer» Correct Answer - B During adsorption, there is always a decrease in residual forces of the surface i.e., there is decrease in surface energy which appears as heat. Adsorption, therefore, is invariable accompanied by evolution of heat i.e., it is an exothermic process, when a gas is adsorbed, the freedom of movement of **** molecules becomes restricted. this amounts to decrease in entropy of the gas after adsorption i.e, `DeltaS` is negative. Adsorptio is thus, accompanied by decrease in enthalpy as well decrease in entropy of the system. |
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