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In physical adsorption the forces associ...

In physical adsorption the forces associated are

A

ionic

B

covalent

C

van der Waals

D

hydrogen bonding

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Read the given passage and answers following questions : There are mainly two type of adsorption of gases on solids. If accumulation of gases on the surface of solid occurs on account of weak vander waal forces, the adsorption is termed as physical adsorption. When gas molecules or atoms held to solid surface by chemical bonds, adsorption is termed as chemical adsorption. The chemical bonds may be covalent or ionic. Chemical adsorption involves a high energy of activation therefore it is referred as Activated adsorption. A physical adsorption at low temperature may pass into chemical adsorption temperature is increased. What type of force exist in physical adsorption ?

MODERN PUBLICATION-SURFACE CHEMISTRY-EXERCISE
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  3. In physical adsorption the forces associated are

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  4. Milk is a colloidal solution of ................ in ............ .

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  5. Colloids can be purified by peptization. (True/False)

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  6. The protective power of colloids is measured in the unit ................

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  7. The curve showing the variation of adsorption with pressure at constan...

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  8. Differentiate between absorption and adsorption.

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  9. What do you understand by true solution, colloidal solution and suspen...

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  10. Comment on the statement that “colloid is not a substance but a state ...

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  11. An atom of element E contains 3 protons, 3 electrons and 4 neutrons : ...

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  12. How are colloids classified on the basis of : interaction between disp...

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  13. How will you prepare a collidal solution of gold?

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  15. Write two differences between sols and emulsions.

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  18. Electrical wires are made up of which alloy?

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