MCQ Questions for Class 12 Chemistry Chapter 5 Surface Chemistry with Answers

Students may want to download NCERT MCQ Questions for Class 12 Chemistry Chapter 5 Surface Chemistry with Answers Pdf free download. This Surface Chemistry Class 12 MCQs Questions with Answers can help understand the concepts score better in your Class 12 Chemistry Exam, so make sure you practice these! Check out chapter-wise MCQ Questions for Class 12 Chemistry with Answers.

Surface Chemistry Class 12 MCQs Questions with Answers

Solve this Surface Chemistry Multiple Choice Questions of Class 12 Chemistry Chapter 5 MCQ, so as not to miss out on any concept from being clear about what they mean!

Question 1.
Movement of dispersion medium under the influence of electric field is known as
(a) electrodialysis
(b) electrophoresis
(c) electroosmosis
(d) cataphoresis.

Answer

Answer: (c) electroosmosis


Question 2.
At CMC (Critical Micellisation Cone.) the surface molecules
(a) associate
(b) dissociate
(c) decompose
(d) become completely soluble.

Answer

Answer: (a) associate


Question 3.
Milk is an example of
(a) emulsion
(b) suspension
(c) foam
(d) sol.

Answer

Answer: (a) emulsion


Question 4.
Tyndall effect is due to
(a) electric charge
(b) scattering of light
(c) absorption of light
(d) none of these.

Answer

Answer: (b) scattering of light


Question 5.
Fog is a colloidal system of
(a) liquid dispersed in a gas
(b) gas dispersed in a gas
(c) solid dispersed in gas
(d) solid dispersed in liquid

Answer

Answer: (a) liquid dispersed in a gas


Question 6.
Blood may be purified by
(a) coagulation
(b) dialysis
(c) electro-osmosis
(d) filtration

Answer

Answer: (b) dialysis


Question 7.
Blue colour of water in sea is due to
(a) refraction of blue light by impurities in sea water
(b) scattering of light by water
(c) refraction of blue sky by water
(d) None of these

Answer

Answer: (a) refraction of blue light by impurities in sea water


Question 8.
The cause of Brownian movement is
(a) heat change in liquid state
(b) attractive force between colloidal particles and dispersion medium
(c) bombardment of the colloidal particles by the molecules of the dispersion medium
(d) interaction of charged particles

Answer

Answer: (c) bombardment of the colloidal particles by the molecules of the dispersion medium


Question 9.
Emulsifying agent present in milk that makes it stable is
(a) maltose
(b) casein
(c) lactose
(d) none of these

Answer

Answer: (b) casein


Question 10.
Cloud is an example of
(a) liquid dispersed in gas
(b) solid dispersed in gas
(c) solid dispersed in liquid
(d) none of these

Answer

Answer: (a) liquid dispersed in gas


Question 11.
The colour of sky is due to
(a) absorption of light
(b) transmission of light
(c) scattering of light
(d) all of these

Answer

Answer: (c) scattering of light


Question 12.
Which of the following is lyophobic colloid?
(a) Starch in water
(b) Gum in water
(c) Soap in water
(d) Gold sol

Answer

Answer: (d) Gold sol


Question 13.
At high concentration of soap in water, soap behaves as
(a) molecular colloid
(b) associated colloid
(c) macro molecular colloid
(d) lyophilic colloid

Answer

Answer: (b) associated colloid


Question 14.
The efficiency of a protective colloid is described in terms of
(a) gold number
(b) flocculation number
(c) valence of counter ion
(d) Tyndall effect.

Answer

Answer: (a) gold number


Question 15.
The function of enzymes in the living system is to
(a) maintain pH
(b) catalyse biochemical process
(c) provide immunity
(d) transport oxygen

Answer

Answer: (b) catalyse biochemical process


Question 16.
The ultrafiltration process of purification of colloidal solutions is based on:
(a) optical properties of colloids
(b) electrical properties of colloids
(c) magnetic properties of colloids
(d) size of colloids

Answer

Answer: (d) size of colloids


Question 17.
In physical adsorption the forces associated are
(a) ionic
(b) covalent
(c) van der Waals
(d) hydrogen bonding

Answer

Answer: (c) van der Waals


Question 18.
The colloidal system where liquid is dispersed in solid is
(a) Gel
(b) Aerosol
(c) Emulsion
(d) Foam

Answer

Answer: (a) Gel


Question 19.
Which one of the following has minimum gold number?
(a) Gelatin
(b) Starch
(c) Gum arabic
(d) Sodium oleate

Answer

Answer: (a) Gelatin


Question 20.
Which of the following is not a favourable condition for physical adsorption?
(a) High pressure
(b) -ΔH
(c) High temperature
(d) None of these

Answer

Answer: (c) High temperature


Question 21.
Which property of colloids is not dependent on the charge on colloidal particles?
(a) Coagulation
(b) Electro-osmosis
(c) Tyndall effect
(d) None of these

Answer

Answer: (c) Tyndall effect


Question 22.
Tyndall effect is observed in
(a) True solution
(b) Precipitate
(c) Colloidal solution
(d) Vapour

Answer

Answer: (c) Colloidal solution


Question 23.
In the coagulation of solution As2S3 which has maximum coagulating value
(a) NaCl
(b) KCl
(c) BaCl2
(d) AlCl3

Answer

Answer: (d) AlCl3


Question 24.
Which one has the highest coagulating power for ferric hydroxide sol?
(a) KCl
(b) K2SO4
(c) Na3PO4
(d) NaCl

Answer

Answer: (c) Na3PO4


Assertion and Reason Type Questions

The questions given below consist of an assertion and a reason. Use the following key to choose the appropriate answer.

(a) Both Assertion (A) and Reason (R) are correct statements, and Reason (R) is the correct explanation of the Assertion (A).
(b) Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explanation of the Assertion (A).
(c) Assertion (A) is correct, Reason (R) is wrong statement.
(d) Assertion (A) is wrong, but Reason (R) is correct statement.

Question 25.
Assertion: An ordinary filter paper impregnated with collodion solution stops the flow of colloidal particles.
Reason: Pore size of the filter paper becomes more than the size of colloidal particle.

Answer

Answer: (c) Assertion (A) is correct, Reason (R) is wrong statement.


Question 26.
Assertion: Colloidal solutions show colligative properties.
Reason: Colloidal particles are large in size.

Answer

Answer: (b) Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explanation of the Assertion (A).


Question 27.
Assertion: Colloidal solutions do not show brownian motion.
Reason: Brownian motion is responsible for stability of sols.

Answer

Answer: (d) Assertion (A) is wrong, but Reason (R) is correct statement.


Question 28.
Assertion: Coagulation power of Al3+ is more than Na+
Reason: Greater the valency of the flocculating ion added, greater is its power to cause precipitation (Hardy- Schulze rule).

Answer

Answer: (a) Both Assertion (A) and Reason (R) are correct statements, and Reason (R) is the correct explanation of the Assertion (A).


Question 29.
Assertion: Detergents with low CMC are more economical to use.
Reason: Cleansing action of detergents involves the formation of micelles. These are formed when the concentration of detergents becomes equal to CMC.

Answer

Answer: (a) Both Assertion (A) and Reason (R) are correct statements, and Reason (R) is the correct explanation of the Assertion (A).


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