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

What is Helmholtz double layer?

What is Ultrafilteration?

Give the methods of purification of colloids.

Why are colloids purified?

What is ultrasonic dispersion?

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Answers Key:

Generic 2

5 x 2 = 10

(i) The surface of colloidal particle adsorbs one type of ion due to preferential adsorption.
(ii) This layer attracts the oppositely charged ions in the medium and hence at the boundary separating the two electrical double layers are setup. This is called as Helmholtz electrical double layer.

The separation of sol particles from electrolyte by filteration through an ultrafilter is called ultrafiltration.

Purification of colloidal solution can be done by the following methods.
(i) Dialysis
(ii) Electrodialysis
(iii) Ultrafilteration.

The colloidal solutions due to their different methods of preparation may contain impurities. If they are not removed, they may destablise and precipitate the colloidal solution.

Sound waves of frequency more than 20kHz (audible limit) could cause transformation of course suspension to colloidal dimensions.