MCQ Questions for Class 12 Chemistry Chapter 5 Surface Chemistry with Answers
CBSE: NCERT Solutions for Class 12 Chemistry Chapter 5 Surface Chemistry MCQ’s with Answers
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NCERT Physics MCQs for Class 12 Chemistry Chapter 5 Surface Chemistry PDF
Q1.Cottrell smoke precipitator works on the principle of:
(b) neutralisation of charge on colloids
(c) Le-chatelier’s principle
(d) Addition of electrolytes.
Answer: (b) neutralisation of charge on colloids
Q 2.Which of the following is a lyophobic colloid?
(a) gelatin (b) sulphur (c) starch (d) gum arabic.
Answer: (b) sulphur
Q 3.The nature of bonding forces in adsorption are
(a) purely physical such as Van der Waal’s forces (b) purely chemical (
c) both chemical and physical (d) sometimes physical and sometimes chemical
Answer: (c) both chemical and physical
Q4.Colloidal solutions are classified on the basis of:
(a) molecular size (b) organic or inorganic (c) surface tension value (d) pH value.
Answer: (a) molecular size
Q5.Surface tension of lyophilic sols is:
(a) lower than that of H2O (b) more than that of H2O (c) Equal to that of H2O (d) none
Answer: (a) lower than that of H2O
Q6.Colloidal sol is:
(a) true solution (b) suspension (c) heterogeneous sol (d) homogeneous sol.
Answer: (c) heterogeneous sol
Q7.Blood may be purified by:
(a) Dialysis (b) electro-osmosis (c) coagulation (d) Alteration.
Answer: (a) Dialysis
Q8.The protective power of a lyophilic sol is
(a) defined by Hardy-Schulze rule (b) proportional to the quantity of electrical charge on it
(c) measured in terms of gold number (d) determined by the size of its colloidal particles.
Answer: (c) measured in terms of gold number
Q9.Which one of the following forms micelles in aqueous solution above certain concentration?
(a) Glucose (b) Urea (c) Dodecyl trimethyl ammonium chloride (d) Pyridinium chloride
Answer: (c) Dodecyl trimethyl ammonium chloride
Q10.Adsorption of gases on solid surface is generally exothermic because
(a) enthalpy is positive (b) entropy decreases (c) entropy increases (d) free energy increases.
Answer: (b) entropy decreases
Q11.Identify the gas which is readily adsorbed by activated charcoal.
(a) N2 (b) SO2 (c) H2 (d) O2
Answer: (b) SO2
Q12. In coagulating the colloidal solution of AS2S3, which has the minimum coagulating value?
a) NaCl (b) KCl (c) BaCl2 (d) AICl3
Answer: (d) AICl3
Q13.Which of the following forms cationic micelles above certain concentration?
(a) sodium dodecyl sulphate (b) sodium acetate
(c) urea (d) cetyl trimethyl ammonium bromide.
Answer: (d) cetyl trimethyl ammonium bromide.
Q14.The Tyndall effect associated with colloidal particles is due to
(a) presence of electrical (b) scattering of light charge
(c) absorption of light (d) reflection of light
Answer: (c) absorption of light
Q15.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: (a) liquid dispersed in a gas
Q16.Blood may be purified by
(a) coagulation (b) dialysis
(c) electro-osmosis (d) filtration
Answer: (b) dialysis
Q17.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: (a) refraction of blue light by impurities in sea water
Q18.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: (c) bombardment of the colloidal particles by the molecules of the dispersion medium
Q19.Emulsifying agent present in milk that makes it stable is
(a) maltose (b) casein (c) lactose (d) none of these
Answer: (b) casein
Q20.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: (a) liquid dispersed in gas
Q21.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: (a) gold number
Q22.The function of enzymes in the living system is to
(a) maintain pH (b) catalyse biochemical process
(c) provide immunity (d) transport oxygen
Answer: (b) catalyse biochemical process
Q23.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: (d) size of colloids
Q24.In physical adsorption the forces associated are
(a) ionic (b) covalent (c) van der Waals (d) hydrogen bonding
Answer: (c) van der Waals
Q25.The colloidal system where liquid is dispersed in solid is
(a) Gel (b) Aerosol (c) Emulsion (d) Foam
Answer: (a) Gel
We hope that the given NCERT MCQ Questions for Class 12 Chemistry with Answers MCQ Chapter 5 Surface ChemistryFree Pdf download will help you in gaining knowledge on the subject.