Here, you will get Class 12 Chemistry MCQ of Chapter 5 Surface Chemistry for cracking JEE and NEET/AIIMS. By solving these MCQs of Class 12 Chemistry Chapter 5 Surface Chemistry, you will get the confidence to crack JEE or NEET. Practice MCQ Questions for Class 12 Chemistry with Answers on a daily basis and score well in exams.
Surface Chemistry 12 MCQs Questions with Answers
Tyndall effect confirms the
(a) gravity effect on the sol. particles
(b) light scattering by the sol. particles
(c) heterogeneous nature of sols.
(d) Brownian motion of the sol. particles
Answer: (c) heterogeneous nature of sols
Shape selective catalysis is a reaction catalysed by
(a) zeolite
(b) enzymes
(c) platinum
(d) Ziegler-Natta catalyst
Answer: (a) zeolite
The oxide of nitrogen which acts as a catalyst in lead chamber process is
(a) NO
(b) NO2
(c) N2O4
(d) H2O5
Answer: (a) NO
A colloidal system is which liquid is dispersed phase and solid is dispersion medium is classified as
(a) gel
(b) sol
(c) emulsion
(d) aerosol
Answer: (a) gel
Fog in an example of colloidal system of
(a) liquid in gas
(b) gas in liquid
(c) solid in gas
(d) gas in solid
Answer: (a) liquid in gas
According to adsorption theory of catalysis, the speed of the reaction increases because
(a) the concentration of the reactant molecules at the active centres of the catalyst becomes high due to adsorption.
(b) in the process of adsoption, the activation energy of the molecules becomes large.
(c) adsorption produces heat which increases the speed of the reaction.
(d) adsorption lowers the activation energy of the reaction.
Answer: (d) adsorption lowers the activation energy of the reaction.
When a small amount of FeCl3 is added to a freshly precipitated Fe(OH)3, b reddish brown colloidal solution is obtained. This phenomenon is known as
(a) dialysis
(b) peptization
(c) protection
(d) dissolution
Answer: (c) protection
The potential difference between the fixed charged layer and the diffused layer having opposite charge is called
(a) Zeta potential
(b) Electrokinetic potential
(c) Both (a) and (b)
(d) Streaming potential
Answer: (a) Zeta potential
Which of the following is a lyophobic colloid?
(a) gelatin
(b) sulphur
(c) starch
(d) gum arabic
Answer: (b) sulphur
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
In the colloidal state the particle size ranges
(a) below 1 nm
(b) between 1 nm to 100 nm
(c) more than 100 nm
(d) none of the above
Answer: (b) between 1 nm to 100 nm
Which one of the following is not applicable to chemisorption?
(a) Its heat of adsorption is high
(b) It takes place at high temperature
(c) It is reversible
(d) It forms mono-molerular layers
Answer: (c) It is reversible
Which of the following acts as the best coagulating agent for ferric hydroxide sol?
(a) Potassium ferrocyanide
(b) Potassium chloride
(c) Potassium oxalate
(d) Aluminium chloride
Answer: (a) Potassium ferrocyanide
The size of colloidal particles ranges between
(a) 10-7 – 10-8 cm
(b) 10-9 – 10-11 cm
(c) 10-4 – 10-7 cm
(d) 10-2 – 10-3 cm
Answer: (c) 10-4 – 10-7 cm
An emulsifier is a substance which
(a) stabilises the emulsion
(b) homogenises the emulsion
(c) Coagulates the emulsion
(d) Accelerates the disperson of liquid in liquid
Answer: (a) stabilises the emulsion
Colloidal particles in a sol can be coagulated by
(a) heating
(b) adding an electrolyte
(c) adding oppositely charge sol
(d) any of the above methods
Answer: (d) any of the above methods
Given below are a few electrolytes, indicate which one among them will bring about the coagulation of a gold sol quickest and in the least of concentration?
(a) NaCl
(b) MgSO4
(c) Al2(SO4)3
(d) K4[Fe(CN)6]
Answer: (c) Al2(SO4)3
In Freundlich adsorption isotherm x/m = Kp1/n, the value of ‘n’ at low pressure is
(a) more than one.
(b) less than one.
(c) equal to one
(d) from zero to one
Answer: (c) equal to one
Volume of one mole of any gas at NTP is
(a) 11.2 litre
(b) 22.4 litre
(c) 10.2 litre
(d) 22.8 litre
Answer: (b) 22.4 litre
Which of the following types of metals make the most efficient catalyst?
(a) Alkali metals
(b) Transition metals
(c) Inner transition metals
(d) Alkaline earth metals
Answer: (b) Transition metals
Which of the following gases present in a polluted area will be adsorbed most easily on the charcoal gas mask?
(a) H2
(b) O3
(c) N2
(d) SO2
Answer: (d) SO2
Lyophillic colloids are stable due to
(a) charge on the particles
(b) large size of the particles
(c) small size of the particles
(d) layer of dispersion of medium on the particles.
Answer: (d) layer of dispersion of medium on the particles
When a small amount of FeCl3 is added to a freshly precipitated Fe(OH)3, b reddish brown colloidal solution is obtained. This phenomenon is known as
(a) dialysis
(b) peptization
(c) protection
(d) dissolution
Answer: (c) protection
The substances which behave as colloidal solutions at higher concentration are called
(a) associated colloids
(b) multimolecular colloids
(c) macromolecular colloids
(d) protective colloids
Answer: (a) associated colloids
A colloidal system in which gas bubbles are dispersed in a liquid is known as
(a) foam
(b) aerosol
(c) sol
(d) emulsion
Answer: (a) foam
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