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JEE Main 201510 AprilOnline
Exam
JEE Main
Year
2015
Date
10 April
Mode
Online
Subject
Chemistry
Chapter
Surface Chemistry

JEE Main 2015 · 10 April · Online · Chemistry · Surface Chemistry

The following statements relate to the adsorption of gases on a...

The following statements relate to the adsorption of gases on a solid surface. Identify the incorrect statement among them:

Options

  1. AEntropy of adsorption is negative
  2. BEnthalpy of adsorption is negative
  3. COn adsorption decrease in surface energy appears as heat
  4. DOn adsorption, the residual forces on the surface are increased

Correct answer

D. On adsorption, the residual forces on the surface are increased

Step-by-step solution

Adsorption is spontaneous process ∆G∆ G is -ve. During adsorption randomness of adsorbate molecules reduced and ∆Stotal∆ {S}_{total} is +ve.

∆G=∆H−T∆S∆ G = ∆ H - T ∆ S

∆H=∆G+T∆S∆ H = ∆ G + T ∆ S

∆H∆ H is highly -ve and residual forces on surface are decreased.
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