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5. Thermodynamics and thermochemistry — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry5. Thermodynamics and thermochemistry1 Mark
MCQ
The following statements relate to the adsorption of gases on a solid surfuce. Identify the incorrect statement among them
  • A
    Enthalpy of adsorption is negative
  • B
    Energy appears as heat
  • ✓
    On adsorption, the residual forces on the surface are increased
  • D
    Entropy of adsorption is negative
✓

Answer

Correct option: C.
On adsorption, the residual forces on the surface are increased
c
Adsorption is a phenomena of attracting and retaining the molecules of a substance on the surface of a liquid or a solid resulting into a higher concentration of the molecules on the surface.

After adsorption there is a decrease in the residual forces due to bond formation $\Delta G$, $\Delta H$ and $\Delta S$ all are negative in the case of adsorption.   

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