Students are advised to practice the NCERT MCQ Questions for Class 12 Chemistry Chapter 5 Surface Chemistry with Answers Pdf free download is available here. MCQ Questions for Class 12 Chemistry with Answers are prepared as per the Latest Exam Pattern. Students can solve these Surface Chemistry Class 12 MCQs Questions with Answers and assess their preparation level.
Surface Chemistry Class 12 MCQs Questions with Answers
Solving the Surface Chemistry Multiple Choice Questions of Class 12 Chemistry Chapter 5 MCQ can be of extreme help as you will be aware of all the concepts. These MCQ Questions on Surface Chemistry Class 12 with answers pave for a quick revision of the Chapter thereby helping you to enhance subject knowledge. Have a glance at the MCQ of Chapter 5 Chemistry Class 12 and cross-check your answers during preparation.
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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