Preparing for the Joint Entrance Exam (JEE) can be a daunting task. With so many subjects to cover and so many topics to study, it can be challenging to know where to start. One essential topic in the JEE Mains syllabus is the Surface Chemistry. In this article, we will provide 50+ MCQ Questions Surface Chemistry, along with detailed solutions to help you prepare for the JEE Mains exam.
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These 50+ MCQ questions are selected by the experts of studyrate.in and these are more difficult questions, which will help you to better understand Surface Chemistry JEE Mains MCQ Questions with Answers.
Surface Chemistry JEE Mains MCQ
Which of the following processes is not a part of the preparation of a colloidal solution? a) Condensation b) Dispersion c) Dialysis d) Coagulation
Answer: a) Condensation
Explanation: Condensation is not a part of the preparation of a colloidal solution. It refers to the conversion of a vapor or gas into a liquid or solid.
The phenomenon of the movement of colloidal particles under the influence of an electric field is called: a) Electrophoresis b) Coagulation c) Dialysis d) Adsorption
Answer: a) Electrophoresis
Explanation: Electrophoresis is the phenomenon of the movement of colloidal particles under the influence of an electric field. It helps separate and characterize colloidal particles based on their charge.
The process of converting a colloidal solution into a gel by the addition of an electrolyte is called: a) Peptization b) Coagulation c) Dialysis d) Electrophoresis .
Answer: b) Coagulation
Explanation: Coagulation is the process of converting a colloidal solution into a gel by the addition of an electrolyte. It leads to the aggregation of colloidal particles and the formation of larger particles
Tyndall effect is observed when: a) Light is passed through a colloidal solution b) A solution undergoes dialysis c) A gel is formed from a colloidal solution d) A solution is coagulated
Answer: a) Light is passed through a colloidal solution
Explanation: Tyndall effect is observed when a beam of light is passed through a colloidal solution. It causes the scattering of light by the colloidal particles, making the path of light visible.
Which of the following is an example of a lyophilic colloid? a) Starch sol b) Gold sol c) Sulphur sol d) Asbestos sol
Answer: a) Starch sol
Explanation: Starch sol is an example of a lyophilic (solvent-loving) colloid. Lyophilic colloids have a high affinity for the solvent and form stable colloidal solutions.
The adsorption of a gas on a solid surface is usually accompanied by: a) A decrease in pressure b) An increase in temperature c) An increase in volume d) A decrease in entropy
Answer: d) A decrease in entropy
Explanation: The adsorption of a gas on a solid surface is usually accompanied by a decrease in entropy. The gas molecules become localized on the surface, leading to a decrease in disorder or entropy.
Which of the following is an example of chemisorption? a) Physisorption of N2 on activated charcoal b) Physisorption of O2 on activated charcoal c) Adsorption of H2 on a platinum catalyst d) Adsorption of Ar on a silica gel
Answer: c) Adsorption of H2 on a platinum catalyst
Explanation: Chemisorption involves a chemical reaction between the adsorbate and the adsorbent. The adsorption of H2 on a platinum catalyst is an example of chemisorption.
Which of the following factors does not affect the rate of adsorption? a) Surface area of the adsorbent b) Temperature c) Pressure d) Concentration of the adsorbate
Answer: c) Pressure
Explanation: Pressure does not directly affect the rate of adsorption. Factors such as surface area, temperature, and concentration of the adsorbate can influence the rate of adsorption.
The process of the movement of a solvent through a semipermeable membrane is called: a) Adsorption b) Dialysis c) Coagulation d) Electrophoresis
Answer: b) Dialysis
Explanation: Dialysis is the process of the movement of a solvent through a semipermeable membrane. It is used to separate colloidal particles from smaller molecules or ions.
The process in which a solid is deposited from a solution onto a solid surface is called: a) Coagulation b) Adsorption c) Desorption d) Precipitation
Answer: d) Precipitation
Explanation: Precipitation is the process in which a solid is deposited from a solution onto a solid surface. It involves the formation of insoluble particles that settle down or adhere to the surface.
The critical micelle concentration (CMC) is the concentration at which: a) The adsorption of solute reaches its maximum b) Micelles start to form in a solution c) The surface tension of a liquid becomes zero d) The colloidal particles start to coagulate
Answer: b) Micelles start to form in a solution
Explanation: The critical micelle concentration (CMC) is the concentration at which surfactant molecules start to aggregate and form micelles in a solution. Above the CMC, the concentration of individual surfactant molecules decreases.
Which of the following is an example of a protective colloid? a) Ferric hydroxide sol b) Starch sol c) Gold sol d) Sulphur sol
Answer: a) Ferric hydroxide sol
Explanation: Ferric hydroxide sol is an example of a protective colloid. Protective colloids stabilize the dispersed phase by forming a protective layer around the colloidal particles, preventing their coagulation.
The process of the breakdown of larger colloidal particles into smaller ones is called: a) Peptization b) Coagulation c) Dialysis d) Electrophoresis
Answer: a) Peptization
Explanation: Peptization is the process of breaking down larger colloidal particles into smaller ones. It involves the addition of a suitable electrolyte or other dispersing agents to disperse the coagulated particles.
Which of the following factors affects the rate of coagulation? a) Presence of charge on colloidal particles b) Nature of the dispersion medium c) Temperature d) All of the above
Answer: d) All of the above
Explanation: The rate of coagulation is influenced by factors such as the presence of charge on colloidal particles, the nature of the dispersion medium, and temperature. These factors affect the stability and interactions of the colloidal particles.
The shape of a micelle in a solution depends on: a) The concentration of the micelle b) The size of the surfactant molecules c) The nature of the solvent d) The temperature
Answer: b) The size of the surfactant molecules
Explanation: The shape of a micelle in a solution depends on the size and structure of the surfactant molecules. Surfactant molecules with a larger hydrophobic part tend to form spherical micelles, while those with a linear structure may form cylindrical or lamellar micelles.
Which of the following is not a method for the preparation of colloidal solutions? a) Condensation b) Dispersion c) Peptization d) Reduction
Answer: a) Condensation
Explanation: Condensation is not a method for the preparation of colloidal solutions. It refers to the conversion of a vapor or gas into a liquid or solid.
The phenomenon of catalytic poisoning involves: a) The adsorption of catalyst on the reactant surface b) The inhibition of the catalytic activity by a foreign substance c) The destruction of the catalyst by a chemical reaction d) The decrease in the surface area of the catalyst
Answer: b) The inhibition of the catalytic activity by a foreign substance
Explanation: Catalytic poisoning involves the inhibition of the catalytic activity by a foreign substance. It can be due to the adsorption of the poison on the catalyst surface, which reduces its effectiveness.
Langmuir adsorption isotherm is applicable for: a) Physical adsorption b) Chemical adsorption c) Both physical and chemical adsorption d) Adsorption at low temperatures
Answer: b) Chemical adsorption
Explanation: Langmuir adsorption isotherm is applicable for chemical adsorption. It assumes that the adsorption occurs through specific chemical bonds between the adsorbate and the adsorbent.
The process of removing the adsorbed substance from the surface of an adsorbent is called: a) Adsorption b) Desorption c) Absorption d) Coagulation
Answer: b) Desorption
Explanation: Desorption is the process of removing the adsorbed substance from the surface of an adsorbent. It can occur spontaneously or be facilitated by external factors such as temperature or pressure.
The process of adsorption is exothermic when: a) Physisorption occurs b) Chemisorption occurs c) The adsorbate concentration is high d) The adsorbent surface area is large
Answer: b) Chemisorption occurs
Explanation: The process of adsorption is generally exothermic when chemisorption occurs. Chemisorption involves the formation of chemical bonds between the adsorbate and the adsorbent, leading to the release of energy.
The process of adsorption is reversible when: a) The adsorption is physical in nature b) The adsorbate concentration is high c) The adsorbent surface area is small d) The temperature is low
Answer: a) The adsorption is physical in nature
Explanation: Physical adsorption is usually reversible, meaning that the adsorbate can be easily desorbed from the surface of the adsorbent. This is because physical adsorption involves weak van der Waals forces.
Which of the following substances can act as a surfactant? a) Water b) Sodium chloride c) Soap d) Copper
Answer: c) Soap
Explanation: Soap is a type of surfactant. Surfactants are substances that reduce the surface tension between two phases, such as water and oil, by adsorbing at the interface between them.
The phenomenon of adsorption is mainly influenced by: a) Temperature b) Pressure c) Nature of the adsorbate d) Surface area of the adsorbent
Answer: d) Surface area of the adsorbent
Explanation: The phenomenon of adsorption is mainly influenced by the surface area of the adsorbent. A larger surface area provides more sites for adsorption, leading to a higher adsorption capacity.
The adsorption isotherm used to describe heterogeneous catalysis is: a) Langmuir adsorption isotherm b) Freundlich adsorption isotherm c) BET adsorption isotherm d) Henry’s law
Answer: c) BET adsorption isotherm
Explanation: BET (Brunauer-Emmett-Teller) adsorption isotherm is commonly used to describe the adsorption of gases on the surface of solids in heterogeneous catalysis. It accounts for multilayer adsorption.
Which of the following factors does not affect the rate of physisorption? a) Temperature b) Pressure c) Nature of the adsorbate d) Surface area of the adsorbent
Answer: d) Surface area of the adsorbent
Explanation: The rate of physisorption is not significantly affected by the surface area of the adsorbent. It is mainly influenced by factors such as temperature, pressure, and the nature of the adsorbate.
The catalytic activity of a solid catalyst depends on its: a) Surface area b) Volume c) Density d) Mass
Answer: a) Surface area
Explanation: The catalytic activity of a solid catalyst primarily depends on its surface area. A larger surface area provides more active sites for the reactants to adsorb and participate in catalytic reactions.
The process of adsorption is spontaneous when: a) ΔG > 0 b) ΔG = 0 c) ΔG < 0 d) ΔG is not related to adsorption
Answer: c) ΔG < 0
Explanation: The process of adsorption is spontaneous when the Gibbs free energy change (ΔG) is negative. This indicates that the adsorption process is thermodynamically favorable.
Which of the following is an example of a zeolite catalyst? a) Platinum b) Palladium c) Sodium aluminate d) Zeolite-Y
Answer: d) Zeolite-Y
Explanation: Zeolite-Y is an example of a zeolite catalyst. Zeolites are crystalline aluminosilicates with a porous structure and high surface area, making them effective catalysts for various reactions.
The phenomenon of adsorption finds applications in: a) Catalysis b) Water treatment c) Gas separation d) All of the above
Answer: d) All of the above
Explanation: Adsorption finds applications in various fields, including catalysis, water treatment, and gas separation. It is a versatile process used for purification, removal of pollutants, and enhancement of chemical reactions.
The process of adsorption is commonly used in: a) Chromatography b) Distillation c) Filtration d) Decantation
Answer: a) Chromatography
Explanation: The process of adsorption is commonly used in chromatography, a technique used to separate and analyze mixtures. Different components of the mixture adsorb to a stationary phase and are eluted at different rates.
We hope there JEE MCQ of Class 12 :Surface Chemistry will help you to score an excellent rank in JEE Mains and Advanced. If you have any queries feel free to write in the comments section. We at Study Rate are always ready to serve our students.
