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

Published on: 25/05/2021

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Std: 12th Standard CBSE - Chemistry

chapter: - NCERT Exemplers

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Questions:

1 Marks

5 x 1 = 5

Give one example each of 'oil in water' and water in oil' emulsion.

Which of the following is most effective electrolyte in the coagulation of Fe₂O₃.H₂O/Fe³⁺ sol?

KCI, AICI₃, MgCl₂, K₄[Fe(CN)₆]

Define electrophoresis.

Name the type of potential difference produced between the fixed charge layer and diffsed layer having opposite charges around the colloidal particle.

What is the main cause of charge on a colloidal solution?

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Answers Key:

1 Marks

5 x 1 = 5

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Oil in water emulsion-Milk. Water in oil emulsion-Butter.

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K₄[Fe(CN)₆] because oppositely charged negative ions, [Fe(CN)₆]^4- have maximum valency.

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The movement of colloidal particles under the influence of an electric field is called electrophoresis.

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Zeta potential.

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The charge on the colloidal particles particles is due to adsorption of common ions of the electrolyte on the surface of the colloidal particles, e.g., Fe³⁺ from FeCl₃ on the surface of Fe(OH)₃particles.