Multiple Choice Questions (MCQs) for JEE Chemistry: Surface Chemistry
Review structured MCQ sets for JEE Chemistry Surface Chemistry. Built according to official JEE guidelines, these downloadable questions support daily revision and core concept reinforcement.
Practice Surface Chemistry MCQs for JEE Chemistry
Navigate directly to the 50 objective questions for Surface Chemistry using the digital viewer below. Each practice set includes verified answer keys, allowing students to instantly cross-check their work and identify areas requiring further revision.
Multiple Choice Questions
(a) Accumulates on the surface of another substance
(b) Goes into the body of another substance
(c) Remains close to another substance
(d) Oxidises or reduces another substance
Show Answer & Explanation
Answer: (a) Accumulates on the surface of another substance
Explanation:
1. Adsorption is the accumulation of molecules of a gas or liquid on the surface of a solid or liquid. Penetration into the bulk is absorption.
Teacher's Note:
1. Adsorption is a surface phenomenon.
(a) Endothermic
(b) Exothermic
(c) Accompanied by an increase in entropy
(d) Accompanied by an increase in enthalpy
Show Answer & Explanation
Answer: (b) Exothermic
Explanation:
1. Adsorption lowers the free energy of the surface and the freedom of the adsorbate, so both enthalpy and entropy decrease. As delta G is negative, delta H must be negative.
Teacher's Note:
1. Delta H is negative for adsorption.
(a) \( T\Delta S \) is positive
(b) \( \Delta H - T\Delta S \) is negative
(c) \( \Delta H \) is positive
(d) \( T\Delta S \) and \( \Delta G \) become zero
Show Answer & Explanation
Answer: (b) \( \Delta H - T\Delta S \) is negative
Explanation:
1. Adsorption is spontaneous, so delta G = delta H - T delta S is negative. Delta H is negative and delta S is also negative.
Teacher's Note:
1. Spontaneous means delta G is negative.
(a) Chemisorption
(b) Physical adsorption
(c) Absorption
(d) Multilayer adsorption
Show Answer & Explanation
Answer: (a) Chemisorption
Explanation:
1. In chemisorption the adsorbate forms chemical bonds with the surface, so it is specific, irreversible and unilayered.
Teacher's Note:
1. Chemisorption is also called activated adsorption.
(a) Adsorption is irreversible
(b) Enthalpy of adsorption is about 80 to 240 kJ/mol
(c) Adsorption is specific
(d) Adsorption is multilayered
Show Answer & Explanation
Answer: (d) Adsorption is multilayered
Explanation:
1. Chemisorption stops at one layer because the adsorbate bonds to surface atoms. Physical adsorption can be multilayered.
Teacher's Note:
1. Chemisorption is unimolecular.
(a) Adsorption isotherm
(b) Adsorption isobar
(c) Adsorption isochore
(d) Freundlich isotherm
Show Answer & Explanation
Answer: (b) Adsorption isobar
Explanation:
1. Constant pressure gives isobar, constant temperature gives isotherm.
Teacher's Note:
1. Iso-bar means constant pressure.
(a) Increasing temperature
(b) Increasing surface area of the adsorbent
(c) Decreasing surface area of the adsorbent
(d) Decreasing concentration of solute
Show Answer & Explanation
Answer: (b) Increasing surface area of the adsorbent
Explanation:
1. More surface gives more sites for adsorption. Adsorption usually decreases with a rise in temperature.
Teacher's Note:
1. Powdered adsorbents are more effective.
(a) Directly proportional to pressure
(b) Inversely proportional to pressure
(c) Proportional to the square of pressure
(d) Independent of pressure
Show Answer & Explanation
Answer: (d) Independent of pressure
Explanation:
1. \( x/m = k P^{1/n} \). At high pressure 1/n tends to 0, so x/m becomes constant.
Teacher's Note:
1. The surface becomes saturated.
(a) Silica gel
(b) Alumina gel
(c) Charcoal
(d) Both silica gel and alumina gel
Show Answer & Explanation
Answer: (d) Both silica gel and alumina gel
Explanation:
1. Silica gel and aluminium oxide gel adsorb water vapour strongly and are used as drying agents.
Teacher's Note:
1. Gels have a large surface area.
(a) 4 to 20 kJ/mol
(b) 80 to 240 kJ/mol
(c) 20 to 40 kJ/mol
(d) 500 to 1000 kJ/mol
Show Answer & Explanation
Answer: (b) 80 to 240 kJ/mol
Explanation:
1. Chemisorption involves bond formation and has enthalpy changes similar to those of chemical reactions. Physical adsorption is about 20 to 40 kJ/mol.
Teacher's Note:
1. Chemisorption is much stronger than physisorption.
(a) Palladium
(b) Nickel
(c) \( \ce{Fe(OH)3} \)
(d) Platinum
Show Answer & Explanation
Answer: (a) Palladium
Explanation:
1. Palladium absorbs up to about 900 times its own volume of hydrogen.
Teacher's Note:
1. Palladium forms non-stoichiometric hydrides.
(a) Critical temperature
(b) Room temperature
(c) Optimum temperature
(d) Absolute temperature
Show Answer & Explanation
Answer: (c) Optimum temperature
Explanation:
1. Catalysts, and especially enzymes, work best at an optimum temperature.
Teacher's Note:
1. Too high a temperature can destroy an enzyme.
(a) HCl
(b) \( \ce{MnO2} \)
(c) \( \ce{C2H5OH} \)
(d) \( \ce{Cl2} \)
Show Answer & Explanation
Answer: (b) \( \ce{MnO2} \)
Explanation:
1. \( \ce{2KClO3 ->[MnO2] 2KCl + 3O2} \). Manganese dioxide lowers the decomposition temperature.
Teacher's Note:
1. MnO2 is a heterogeneous catalyst.
(a) Molecular weight
(b) Physical state
(c) Number of free valencies on the surface
(d) Amount of catalyst used
Show Answer & Explanation
Answer: (c) Number of free valencies on the surface
Explanation:
1. Free valencies on the surface give strong adsorption of the reactants.
Teacher's Note:
1. Active sites matter most.
(a) Cu; ZnO-Cr2O3; Ni
(b) Cu; Ni; Cu
(c) Ni; Cu; ZnO-Cr2O3
(d) Ni; ZnO-Cr2O3; Cu
Show Answer & Explanation
Answer: (d) Ni; ZnO-Cr2O3; Cu
Explanation:
1. Ni gives methane, ZnO with \( \ce{Cr2O3} \) gives methanol, and copper gives methanal. This shows the selectivity of catalysts.
Teacher's Note:
1. Same reactants but different catalysts give different products.
(a) Fe
(b) Pt
(c) Ni
(d) Enzyme
Show Answer & Explanation
Answer: (d) Enzyme
Explanation:
1. Enzymes are proteins that denature when heated beyond their optimum temperature.
Teacher's Note:
1. Enzymes work around 298 to 310 K.
(a) \( \ce{As2O3} \)
(b) As
(c) \( \ce{H2} \)
(d) Ar
Show Answer & Explanation
Answer: (b) As
Explanation:
1. \( \ce{2AsH3 -> 2As + 3H2} \). The arsenic that forms catalyses the decomposition.
Teacher's Note:
1. An autocatalyst is a product that speeds up its own formation.
(a) Formation of \( \ce{SO3} \) in the lead chamber process
(b) Formation of \( \ce{SO3} \) in the contact process
(c) Hydrolysis of ester with an acid
(d) Hydrolysis of sugar in the presence of sulphuric acid
Show Answer & Explanation
Answer: (b) Formation of \( \ce{SO3} \) in the contact process
Explanation:
1. In the contact process, solid \( \ce{Pt} \) or \( \ce{V2O5} \) acts on gases, so it is heterogeneous. In the lead chamber process, NO gas catalyses gaseous reactants.
Teacher's Note:
1. Same phase for catalyst and reactants means homogeneous.
(a) Adsorption of reactants
(b) Diffusion of reactants along the surface
(c) Reaction at the active site to form adsorbed products
(d) Decomposition of the catalyst
Show Answer & Explanation
Answer: (d) Decomposition of the catalyst
Explanation:
1. A catalyst is not consumed during the reaction. Adsorption, surface diffusion, reaction at the active site and desorption are the steps.
Teacher's Note:
1. Catalysts remain unchanged chemically.
(a) Enzymes work best at an optimum temperature
(b) Enzymes work at an optimum pH
(c) Enzymes are highly specific for a substrate
(d) An enzyme raises the activation energy
Show Answer & Explanation
Answer: (d) An enzyme raises the activation energy
Explanation:
1. Enzymes lower the activation energy of the reaction.
Teacher's Note:
1. All catalysts lower activation energy.
(a) ZSM-5
(b) \( \ce{AgNO3} \)
(c) \( \ce{Mg(OH)2} \)
(d) \( \ce{Co(OH)3} \)
Show Answer & Explanation
Answer: (a) ZSM-5
Explanation:
1. ZSM-5 is an aluminosilicate zeolite that converts alcohols to gasoline range hydrocarbons.
Teacher's Note:
1. Zeolites are shape-selective.
(a) Size-selective catalysis
(b) Shape-selective catalysis
(c) Metal oxide catalysis
(d) Transition metal catalysis
Show Answer & Explanation
Answer: (b) Shape-selective catalysis
Explanation:
1. In shape-selective catalysis only molecules that fit the pores of the zeolite can react.
Teacher's Note:
1. Zeolites are used in petroleum cracking.
(a) Positive catalyst
(b) Negative catalyst
(c) Autocatalyst
(d) Induced catalyst
Show Answer & Explanation
Answer: (c) Autocatalyst
Explanation:
1. Mn2+ is a product that accelerates the reaction, so it is an autocatalyst (the reaction speeds up after a while).
Teacher's Note:
1. Autocatalysis shows a slow start.
(a) Negatively charged
(b) Neutral
(c) Positively charged
(d) Both positively and negatively charged
Show Answer & Explanation
Answer: (c) Positively charged
Explanation:
1. Basic dyes such as methylene blue form positively charged sols. Acid dyes such as eosin form negatively charged sols.
Teacher's Note:
1. Basic dye gives a positive sol.
(a) Macromolecular colloid
(b) Multimolecular colloid
(c) Associated colloid
(d) Micelle
Show Answer & Explanation
Answer: (b) Multimolecular colloid
Explanation:
1. Aggregates of thousands of \( \ce{S8} \) molecules form the colloidal particles, so the sol is multimolecular.
Teacher's Note:
1. Gold and sulphur sols are multimolecular.
Free study material for Chemistry
Practice MCQs for JEE Chemistry Surface Chemistry
JEE Chemistry Surface Chemistry Objective Test Questions
Review structured objective questions for JEE Chemistry Surface Chemistry. Built according to official JEE guidelines, these MCQ sets support daily revision and core concept reinforcement.
NCERT-Aligned Objective Questions and Solutions
Each question includes structured solution keys mapped directly to standard JEE textbooks, helping students evaluate their reasoning and correct mistakes early in their revision.
Next Steps in Your Exam Preparation
Follow up your worksheet practice by attempting the interactive online Chemistry MCQ test for this chapter to evaluate your execution speed. All platform resources are free to access.
FAQs
You can get most exhaustive JEE Chemistry Surface Chemistry MCQs Set 21 for free on StudiesToday.com. These MCQs for JEE Chemistry are updated for the 2026-27 academic session as per JEE examination standards.
Yes, our JEE Chemistry Surface Chemistry MCQs Set 21 include the latest type of questions, such as Assertion-Reasoning and Case-based MCQs. 50% of the JEE paper is now competency-based.
By solving our JEE Chemistry Surface Chemistry MCQs Set 21, JEE students can improve their accuracy and speed which is important as objective questions provide a chance to secure 100% marks in the Chemistry.
Yes, Chemistry MCQs for JEE have answer key and brief explanations to help students understand logic behind the correct option as its important for 2026 competency-focused JEE exams.
Yes, you can also access online interactive tests for JEE Chemistry Surface Chemistry MCQs Set 21 on StudiesToday.com as they provide instant answers and score to help you track your progress in Chemistry.