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CBSE 12th Standard Chemistry Subject Surface Chemistry Ncert Exemplar Fill Ups Questions 2021

Published on: 25/05/2021

QB365 Provides the updated NCERT Exemplar Questions for Class 12, and also provide the detail solution for each and every case study questions. NCERT Exemplar questions are latest updated question pattern from NCERT, QB365 will helps to get more marks in Exams

Download CBSE Class 12th Standard CBSE Chemistry question papers, sample papers, important questions, and previous year solved papers in PDF format. Get free study materials, NCERT solutions, and exam preparation resources for Class 12th Standard CBSE Chemistry

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Std: 12th Standard CBSE - Chemistry

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Questions:

1 Marks

5 x 1 = 5

What is the role of activated charcoal in gas mask used in coal mines?

Why does the white precipitate of silver halide become coloured in the presence of dye eosin?

What happens when dialysis is prolonged?

Why are some medicines more effective in the colloidal form?

Give an example where physisorption changes to chemisorption with rise in temperature? Explain the reason for change.

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Answers Key:

1 Marks

5 x 1 = 5

Activated charcoal adsorbs the poisonous gases usually present in coal mines.

Eosin dye is adsorbed on the surface of silver halide precipitate making it coloured.

On prolonged dialysis, even the very small amount (trace amount) of the electrolyte which stabilizes the sol is completely removed. Hence, the sol becomes unstable and its coagulation takes place.

Medicines are more effective in the colloidal form because of large surface area due to which they are easily assimilated.

H₂ is adsorbed physically on finely divided nickel at room temperature, but at high temperature, it dissociates into hydrogen atoms which are held on the surface by chemisorption.