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CBSE 12th Standard Chemistry Subject Surface Chemistry Ncert Exemplar 1 Mark Questions 2021

Published on: 25/05/2021

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Std: 12th Standard CBSE - Chemistry

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Questions:

1 Marks

5 x 1 = 5

How does an increase in temperature affect both physical as well as chemical adsorption?

Give the expression of Freundlich isotherms.

Which has a higher enthalpy of adsorption, physisorption or chemisorption?

What is meant by chemical adsorption?

Why is chemisorption irreversible?

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Answers Key:

1 Marks

5 x 1 = 5

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With increase of tempwrature, ohysical adsorption decreases while chemisorption first increases and then decreases.

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\(\frac { x }{ m } =k\ { P }^{ 1/N }\ or \log\frac { x }{ m } =log\quad k+\frac { 1 }{ n } log\ P\)
where m is the mass of the adsorbent and x that of adsorbate, P is the pressure of the gas and n is an integer.

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Chemisorption has higher enthalpy of adsorption because in involves chemical bond formation

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If the adsorbate is held on the surface of the adsorbent as a result of chemical reaction forming surface compounds. it is called chemical adsorption.