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NCERT solutions Chemistry Class 12 Part 1 chapter 5 Surface Chemistry

Chapters

NCERT Chemistry Class 12 Part 1

Chemistry Textbook for Class 12 Part 1

Chapter 5 - Surface Chemistry

Pages 127 - 145

Write any two characteristics of Chemisorption.

Q 1 | Page 127

Give reasons for the following observations:

Physisorption decreases with increase in temperature.

Q 2 | Page 127

Why are powdered substances more effective adsorbents than their crystalline forms?

Q 3 | Page 127

It is necessary to remove CO when ammonia is prepared by Haber's process.

Q 4 | Page 133

Why is the ester hydrolysis slow in the beginning and becomes faster after sometime?

Q 5 | Page 133

What is the role of desorption in the process of catalysis?

Q 6 | Page 133

What modification can you suggest in the Hardy-Schulze law?

Q 7 | Page 145

Why is it essential to wash the precipitate with water before estimating it quantitatively?

Q 8 | Page 145

Page 146

Distinguish between the meaning of the terms adsorption and absorption. Give one example of each.

Q 1 | Page 146

What is the difference between physisorption and chemisorption?

Q 2 | Page 146

Give reason why a finely divided substance is more effective as an adsorbent.

Q 3 | Page 146

What are the factors which influence the adsorption of a gas on a solid?

Q 4 | Page 146

What is an adsorption isotherm?

Q 5.1 | Page 146

Describe Freundlich adsorption isotherm.

Q 5.2 | Page 146

What do you understand by activation of adsorbent? How is it achieved?

Q 6 | Page 146

What role does adsorption play in heterogeneous catalysis?

Q 7 | Page 146

Why is adsorption always exothermic?

Q 8 | Page 146

How are the colloidal solutions classified on the basis of physical states of the dispersed phase and dispersion medium?

Q 9 | Page 146

Discuss the effect of pressure and temperature on the adsorption of gases on solids.

Q 10 | Page 146

What are lyophilic and lyophobic sols? Give one example of each type. Why are hydrophobic sols easily coagulated?

Q 11 | Page 146

What is the difference between multimolecular and macromolecular colloids? Give one example of each. How are associated colloids different from these two types of colloids?

Q 12 | Page 146

What are enzymes? Write in brief the mechanism of enzyme catalysis.

Q 13 | Page 146

How are colloids classified on the basis of Physical states of components

Q 14.1 | Page 146

How are colloids classified on the basis of Nature of dispersion medium

Q 14.2 | Page 146

How are colloids classified on the basis of  Interaction between dispersed phase and dispersion medium?

Q 14.3 | Page 146

Explain what is observed When a beam of light is passed through a colloidal sol.

Q 15.1 | Page 146

Explain what is observed An electrolyte, NaCl is added to hydrated ferric oxide sol.

Q 15.2 | Page 146

Explain what is observed Electric current is passed through a colloidal sol?

Q 15.3 | Page 146

How do emulsifires stabilise emulsion? Name two emulsifiers.

Q 17 | Page 146

Action of soap is due to emulsification and micelle formation. Comment.

Q 18 | Page 146

Give four examples of heterogeneous catalysis.

Q 19 | Page 146

What do you mean by activity and selectivity of catalysts?

Q 20 | Page 146

Describe some features of catalysis by zeolites.

Q 21 | Page 146

What is shape selective catalysis?

Q 22 | Page 146

Explain the term Electrophoresis

Q 23.1 | Page 146

Explain the terms Coagulation

Q 23.2 | Page 146

Explain the terms Dialysis 

Q 23.3 | Page 146

Explain the terms Tyndall effect.

Q 23.4 | Page 146

Give four uses of emulsions.

Q 24 | Page 146

What are micelles? Give an example of a micellers system.

Q 25 | Page 146

Explain the terms with suitable examples: - Alcosol

Q 26.1 | Page 146

Explain the terms with suitable examples Aerosol 

Q 26.2 | Page 146

Explain the terms with suitable examples: Hydrosol

Q 26.3 | Page 146

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

Q 27 | Page 146

NCERT Chemistry Class 12 Part 1

Chemistry Textbook for Class 12 Part 1
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