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NTA Abhyas 2020
Exam
NTA Abhyas
Year
2020
Subject
Chemistry
Chapter
Surface Chemistry

NTA Abhyas 2020 · Chemistry · Surface Chemistry

Adsorption of gases on solid surface is generally exothermic because

Adsorption of gases on solid surface is generally exothermic becauseAdsorption of gases on solid surface is generally exothermic because

Options

  1. Aenthalpy is positive
  2. Bentropy decreases
  3. Centropy increases
  4. Dfree energy increases

Correct answer

B. entropy decreases

Step-by-step solution

Thermodynamics of adsorption:
Adsorption of gases on solid surface is generally exothermic because
i. ΔS<0\Delta S < 0 because gaseous phase decrease
ii. ΔG<0\Delta G < 0 because process is spontaneous
so ΔG=ΔH−TΔS\Delta G = \Delta H - T\Delta S
- ve = \Delta H - \left(+ve\right) \left(- ve\right)<br/>Δ<br />\Delta H = - ve<br/>iii.Δ<br />iii. \Delta H < 0soadsorptionisanexothermicprocess.so adsorption is an exothermic process.
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