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

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry5. Thermodynamics and thermochemistry1 Mark
MCQ
Which of the following is true with respect to chemical adsorption ?
  • A
    $\Delta H < 0, \Delta S > 0, \Delta G > 0$
  • ✓
    $\Delta H < 0, \Delta S < 0, \Delta G < 0$
  • C
    $\Delta H > 0, \Delta S > 0, \Delta G < 0$
  • D
    $\Delta H > 0, \Delta S < 0, \Delta G > 0$
✓

Answer

Correct option: B.
$\Delta H < 0, \Delta S < 0, \Delta G < 0$
b
For adsorption process

$\Delta G\, <\,0, \Delta H \,<\,0$ and $\Delta S\, <\,0$

Adsorption of gases on the solid surface is generally exothermic because entropy decreases. Adhering of gas molecules to the surface lowers randomness.

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