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12th Standard English Medium Chemistry Subject Surface Chemistry Creative 2 Mark Questions with Solution Part - II updated Creative Questions

Published on: 13/05/2022

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Std: 12th Standard - Chemistry

chapter: - Creative Questions

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Questions:

Generic 2

5 x 2 = 10

Name the types of emulsions.

Which will adsorb more gas, a lump of charcoal or its powder and why?

Why is a colloidal sol stable?

Explain the formation of delta.

What is peptisation? Give an example.

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Answers Key:

Generic 2

5 x 2 = 10

(i) Oil dispersed in water (O/W type)
(ii) Water dispersed in oil (W/O type).

Powdered charcoal will adsorb more gas because of its larger surface area than a lump of charcoal.

All the particles in a colloidal sol carry the same charge and hence keep on repelling each other and cannot aggregate together to form bigger particles.

(i) River water is colloidal solution of clay. Sea water contains a number of electrolytes.
(ii) When river water meets the sea water, the electrolytes present in sea water coagulate the colloidal solution of clay which get deposited with the formation of delta.

(i) The dispersion of a precipitated material into colloidal solution by the action of an electrolyte in solution is termed as peptisation.
(ii) The electrolyte used is called a peptizing agent. Eg: Silverchloride can be converted into a sol by adding hydrochloric acid.
\(\underset { Precipitate }{ AgCl } \overset { HCl }{ \longrightarrow } \underset { Colloid }{ AgCl } \)