In this article, engineering aspirant will get complete revision notes of chapter Surface Chemistry including important concepts and previous years’ solved questions for UPSEE/UPTU entrance examination 2018. About 1-2 questions have always been asked from this chapter in the examination. Important topics covered here are given below:
1. Adsorption and Absorption
2. Types of Adsorption
3. Adsorption Isotherm
4. Freundlich Adsorption Isotherm
5. Factors affecting Adsorption of a Gas by a Solid
6. Types of colloid with their dispersed phase and dispersion medium
7. Preparation of colloidal solution
8. Types of solutions
9. Purification of colloidal solutions
10. Properties of colloidal solutions
These notes are prepared by Subject Experts of Chemistry.
UPSEE/UPTU Chemistry Syllabus: 2017 - 2018
Important Concepts:
UPSEE: Important Questions and Preparation Tips – Thermodynamics (Part 1)
UPSEE: Important Questions and Preparation Tips – Solutions
Some previous years’ solved questions are given below:
Question 1:
A colloidal system having a solid substance as a dispersed phase and a liquid as dispersion medium is classified as
(a) Solid sol
(b) Gel
(c) Emulsion
(d) Sol
Solution 1:
It is classified as sol.
Hence, the correct option is (d).
Question 2:
Which of the following is a Lyophobic colloid?
(A) Gelatin
(B) Sulphur
(C) Starch
(D) Gum Arabica
Solution 2:
Sulphur is an example of lyophobic colloid.
Hence, the correct option is (b).
Question 3:
At Critical Micelle Concentration (CMC), the surfactant molecules:
(A) Decompose
(B) Dissociate
(C) Associate
(D) Become completely soluble
Solution 3:
At Critical Micelle Concentration (CMC), the surfactant molecules are always associated.
Hence, the correct option is (c).
Question 4:
Which of the following statements is correct for Tyndall effect?
(a) Scattering and polarising of light by sma11 suspended particles is called Tyndall effect
(b) Tyndall effect of colloidal particles is due to dispersion
(c) Tyndall effect is due refraction of light
(d) Tyndall effect is zig-zag motion of suspended particles
Solution 4:
When light is scattered by particles in a colloid or else particles in a very fine suspension, then it is called Tyndall effect.
Hence, the correct option is (b).
UPSEE: Important Questions and Preparation Tips – States of Matter
Question 5:
Which are of the following is a false statement?
(a) Cell fluid is an example of sol
(b) Butter is an example of gel
(c) Hair cream is an example of emulsion
(d) Cheese is an example of foam
Solution 5:
Cheese is not an example of foam, in fact it is an example of gel in which dispersion medium is solid and dispersed phase is liquid.
Hence, the correct option is (d).
Conclusion:
With the help of these notes aspirants can learn or revise all important concepts related to chapter Surface Chemistry. Engineering aspirants can use these notes for quick revision to save their precious time.
