Surface Chemistry JEE Mains Questions 2025

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Surface Chemistry JEE Mains Questions for Students

When blood cells are placed in a solution of KCl whose osmotic pressure is greater than that of the cell fluid, this occurs due to the

(a) shrinking in size of the cell.

(b) increase in the size of the cell.

(d) first shrinking and then regaining the original size.

Option b – increase in the size of the cell

Which one of the following statements is not correct? ( Surface Chemistry JEE Mains Questions )

(a) The boiling point of an aqueous solution is higher than that of pure water.

(b) The addition of solutes to a solution causes an increase in its water potential.

(d) When a solution is separated from water by semi-permeable membrane water starts a movement.

Option b – The addition of solutes to a solution causes an increase in its water potential

Consider the following statements. I. During the pressure of osmosis, the solvent travels from the concentrated solution to the dilute solution. II. In reverse osmosis, external pressure is applied to the dilute solution. Which of the statement(s) given above is/are correct?

(a) Only I

(b) Only II

(d) Neither I nor II

Option d – Neither I nor II

Assertion (A) In osmosis, solvent molecules pass through a semi-permeable membrane from a more dilute solution to a more concentrated one, when these two are separated by the semi-permeable membrane. Reason (R) The vapor pressure of the solvent over the dilute solution is less than that over the concentrated solution. Codes ( Surface Chemistry JEE Mains Questions )

(a) Both A and R are true and R is the correct explanation of A

(b) Both A and R are true, but R is not the correct explanation of A

(d) A is false, but R is true

Option c – A is true, but R is false

An emulsion is a colloid of an

(a) gas in a liquid.

(b) the liquid in a liquid.

(d) gas in a solid.

Option b – the liquid in a liquid

…………. is one of the most important techniques for the separation of a mixture by passing it in solution or suspension through a medium in which the components move at different rates.

(a) Filtration

(b) Distillation

(d) Chromatography

Option d – Chromatography

A hard shell of an egg was dissolved in HCI. The egg was then placed in a concentrated solution of NaCl. What will happen? ( Surface Chemistry JEE Mains Questions )

(a) The egg will shrink.

(b) The egg will swell.

(d) There will be hardly any visible change.

Option a – The egg will shrink

Soil is an example of which of the following?

(a) Homogeneous mixture

(b) Molecule

(d) Heterogeneous mixture

Option d – Heterogeneous mixture

If an unsaturated sugar solution is prepared by mixing 100 grams of sugar with half a liter of water, which of the following physical quantities will not change? ( Surface Chemistry JEE Mains Questions )

(a) Mass

(b) Density

(d) Volume

Option d – Volume

Which one of the following substances is not a mixture?

(a) Tin

(b) Seawater

(d) Air

Option a – Tin

The pH value of the solution obtained by complete neutralization of hydrochloric acid and sodium hydroxide solution will be ( Surface Chemistry JEE Mains Questions )

(a) exactly 7

(b) zero

(d) less than 7

Option a – exactly 7

Azeotropic mixtures are

(a) a mixture of two solids.

(b) those which boil at different temperatures.

(d) the constant boiling mixture.

Option d – the constant boiling mixture

The solubility of a gas in liquid increases with ( Surface Chemistry JEE Mains Questions )

(a) an increase in temperature.

(b) reduction in gas pressure.

(d) amount of liquid taken.

Option c – decrease in temperature and increase in gas pressure

A solution is

(a) a homogeneous mixture of two or more substances.

(b) a solid dissolved in a liquid.

(d) a mixture of two liquids.

Option a – a homogeneous mixture of two or more substances

A solution that contains the maximum amount of the solute that can be dissolved in a given amount of solvent at a particular temperature is called ( Surface Chemistry JEE Mains Questions )

(a) saturated solution

(b) unsaturated solution

(d) None of the above

Option a – saturated solution

Water is a good solvent. This is due to the high

(a) dielectric constant of water.

(b) the surface tension of water.

(d) heat fusion of water.

Option a – dielectric constant of water

Which one of the following substances is not a mixture? ( Surface Chemistry JEE Mains Questions )

(a) Ice

(b) Ice cream

(d) Honey

Option a – Ice

Blood has been found isotonic with

(a) the saturated solution of NaCl.

(b) the saturated solution of KCI.

(d) the normal sodium chloride solution.

Option d – the normal sodium chloride solution

The process by which milk is converted into curd is called ( Surface Chemistry JEE Mains Questions )

(a) pasteurization

(b) vernalization

(d) retting

Option c – fermentation

Muddy water is purified by adding alum due to

(a) osmosis

(b) emulsification

(d) dialysis

Option c – coagulation

The process of separating cream from milk is called ( Surface Chemistry JEE Mains Questions )

(a) electro-osmosis

(b) emulsion

(d) demulsification

Option d – demulsification

The heating of rubber with sulfur is known as ………

(a) galvanization

(b) sulphonation

(d) vulcanization

Option d – vulcanization

Isotonic solutions have the same ( Surface Chemistry JEE Mains Questions )

(a) normality

(b) molar concentration

(d) density

Option b – molar concentration

The process of diffusion in gases takes place due to

(a) the difference in their densities.

(b) the difference in their composition.

(d) All of the above

Option a – the difference in their densities

Which of the following methods helps in separating cream from milk? ( Surface Chemistry JEE Mains Questions )

(a) Distillation

(b) Centrifugation

(d) Sublimation

Option b – Centrifugation

The coordination number of metal in coordination compounds is

(A) the Same as primary valence

(B) the Same as sec, valance

(D) the Difference between primary and secondary valency

Option b – the Same as sec, valance

Ligands in complex salts are ( Surface Chemistry JEE Mains Questions )

(A) Anions linked by a coordinate bond to a central metal atom

(B) Cations linked by coordinate bonds to the central metal atoms

(D) Ions or molecules linked to the central atom by coordinate bonds

Option d – Ions or molecules linked to the central atom by coordinate bonds

A group of atoms can function as a ligand only when

(A) It is a small molecule

(B) It has unshared electron pair

(D) It is a neutral molecule

Option b – It has unshared electron pair

The number of ions formed when cuprammonium sulfate is dissolved in water is ( Surface Chemistry JEE Mains Questions )

(A) 1

(B) 2

(D) zero

Option b – 2

Which of the following ligands forms a chelate

(A) Acetate

(B) Oxalate

(D) Ammonia

Option b – Oxalate

According to Werner’s theory ( Surface Chemistry JEE Mains Questions )

(A) Primary valency can be ionized

(B) Secondary valency can be ionized.

(D) Only primary valency cannot be ionized

Option a – Primary valency can be ionized

The number of ligands that are directly bonded to a central metal atom or ion in a coordination compound is called

(A) Complex number

(B) Effective atomic number

(D) Co-ordination number

Option d – Co-ordination number

The coordination number of copper in Cupra ammonium sulfate is ( Surface Chemistry JEE Mains Questions )

(A) 2

(B) 6

(D) -4

Option c – 4

Which of the following system is most stable for a chelate

(A) Two fused cyclic systems

(B) Three fused cyclic systems

(D) Five fused cyclic system

Option d – Five fused cyclic system

Which of the following forms of metal chelates ( Surface Chemistry JEE Mains Questions )

(A) Monodentate ligand

(B) Polydentate ligand

(D) Polyatomic ligand

Option b – Polydentate ligand

Which is not a bidentate ligand?

(A) Ethylene diamine

(B) Diethylene triamine

(D) Dimethyl glyoximato

Option b – Diethylene triamine

EDTA is …….. type of ligand ( Surface Chemistry JEE Mains Questions )

(A) Bidentate

(B) Tridentate

(D) Hexadentate

Option d – Hexadentate

In an aqueous solution, potash alum gives

(A) Two types of ions

(B) Only one type of ion

(D) Three types of ions

Option d – Three types of ions

The primary valency of cobalt (in complex) is ……… whereas secondary valance (CN) is….

(A) 2,4

(B) 3,5

(D) 3,6

Option d – 3,6

Which of the following does not give a precipitate with silver nitrate

(A) CoCl3.6NH3

(B) CoCl3.5NH3

(D) CoCl₂.4NH3

Option c – CoCl3.3NH3

An excess of AgNO3 is added to 100 mL of a 0.01 M solution of dichloro tetraaquachromium (III) chloride. The number of moles of AgCl precipitated would be

(A) 0.002

(B) 0.003

(D) 0.001

Option d – 0.001

The compound in which a central metal atom/ion is surrounded by oppositely charged ions or neutral molecules is called

(A) Salts

(B) Double salts

(D) Inorganic compounds

Option c – Co-ordination compounds

The secondary valence of metals corresponds to

(A) Oxidation number

(B) Co-ordination number

(D) the number of electrons in the penultimate shell

Option b – Co-ordination number

The primary valency of metals is satisfied by the formation of

(A) Co-ordination compounds

(B) Complex ions

(D) Covalent compounds

Option c – Simple salts

Which one of the following compounds is used as a starting material for the preparation of potassium dichromate?

(A) K₂SO4.Cr2(SO4).24H2O

(B) K₂ CrO4

(D) PbCrO4.PbO

Option c – Fe Cr₂04

Which one of the following compounds is formed when a mixture of K₂Cr2O7 and NaCl is heated with conc. H₂SO4?

(A) CrO₂Cl₂

(B) CrOCI₂

(D) (CrOCI)2

Option a – CrO₂Cl₂

Mohr’s salt is prepared from equimolar solutions of

(A) Green vitriol and potassium sulfate

(B) Green vitriol and ammonium sulfate

(D) Blue vitriol and ammonium sulfate

Option b – Green vitriol and ammonium sulfate

Transition elements form binary compounds with halogens. Which of the following elements will form MF3-type compounds?

(A) Cr

(B) Co

(D) Ni

Option c – Both A and B

Which of the following will not act as oxidizing agents?

(A) CrO3

(B) MoO3

(D) Both B and C

Option d – Both B and C

Although +3 is the characteristic oxidation state for lanthanoids cerium also shows a +4 oxidation state because

(A) it has variable ionization enthalpy

(B) it has a tendency to attain a noble gas configuration

(D) Both B and C

Option d – Both B and C

In the form of dichromate, Cr (VI) is a strong! the oxidizing agent in an acidic medium but Mo (VI) in Mo O3 and W(VI) in WO3 is not because

(A) Cr (VI) is more stable than Mo(VI) and W(VI).

(B) Mo(VI) and W(VI) are more stable than Cr(VI).

(D) Both B and C

Option d – Both B and C

Which of the following actinoids show oxidation states up to +7?

(A) Am

(B) Pu

(D) Both B and C

Option d – Both B and C

Which of the following lanthanoids show a +2 oxidation state besides the characteristic oxidation state +3 of lanthanoids?

(A) Ce

(B) Eu

(D) Both B and C

Option d – Both B and C

Which of the following is CORRECT for physisorption as well as chemisorption?

(A) Both are highly specific in nature.

(B) Both depend on the surface area of the adsorbent.

(D) Both are favored by low temperatures.

Option b – Both depend on the surface area of the adsorbent.

Which of the following statements is/are CORRECT? i. On application of an electric field, the particles of the colloidal solution may move in both directions or not move at all. ii. The surface tension of lyophobic sol is similar to that of the dispersion medium. iii. Lyophobic sol can be easily coagulated by the addition of an electrolyte.

(A) Only iii

(B) Only i and iii

(D) Only i and ii

Option c – Only ii and iii

In addition to a few drops of FeCl3 to freshly precipitated ferric hydroxide, a red-colored colloidal solution is obtained. This phenomenon is known as ………

(A) peptization

(B) dialysis

(D) coagulation

Option a – peptization

Statement (1): The human body temperature is suitable for enzyme-catalyzed reactions. Statement (2): The optimum temperature range for enzymatic activity is 298-310 K. Select the most appropriate option.

(A) Both statements are correct.

(B) Both statements are incorrect.

(D) Statement (1) is incorrect but statement (2) is correct.

Option a – Both statements are correct.

When AgNO3 solution is added to an excess of a dilute solution of Nal, there is the formation of ……..

(A) negatively charged Agl sol due to the adsorption of I

(B) negatively charged Agl sol due to the adsorption of NO3

(D) positively charged Agl sol due to the adsorption of Na

Option a – negatively charged Agl sol due to the adsorption of I

A substance ‘X’ behaves as a normal strong electrolyte at low concentrations but shows colloidal behavior at higher concentrations due to the formation of aggregates. Which among the following is most likely to be the substance X?

(A) Cellulose

(B) Sulphur

(D) Polystyrene

Option c – Sodium stearate

Whipped cream is an example of dispersion of ……..

(A) solid in gas

(B) gas in liquid

(D) liquid in gas

Option b – gas in liquid

Statement (1): Alum is used in the purification of drinking water. Statement (2): Alum coagulates the suspended impurities present in water. Select the most appropriate option.

(A) Both statements are correct.

(B) Both statements are incorrect.

(D) Statement (1) is incorrect but statement (2) is correct.

Option a – Both statements are correct.

The enzyme urease catalyzes the decomposition of urea in presence of water into ………..

(A) ammonia and hydrogen

(B) nitrogen and carbon dioxide

(D) ammonium hydroxide and carbon monoxide

Option c – ammonia and carbon dioxide

Soap micelles formed in water contain ……….

(A) the polar outer surface and non-polar inner core

(B) the polar inner core and non-polar outer surface

(D) the non-polar inner core and non-polar outer surface

Option a – the polar outer surface and non-polar inner core

Which of the following is associated with the ultrafiltration technique employed for the purification of colloidal solutions?

(A) Collodion solution

(B) Dialyser

(D) Membrane made of animal bladder

Option a – Collodion solution

The extent of adsorption of a gas on solid depends on …….. i. nature of the gas ii. the pressure of the gas iii. the temperature of the gas iv. nature of the adsorbent

(A) only i and ii

(B) only i, ii, and iv

(D) all of these

Option d – all of these

The colloidal system in which the dispersed phase and dispersion medium both are liquid is known as ……..

(A) gel

(B) aerosol

(D) foam

Option c – emulsion

Which of the following statements is CORRECT? (I) When an animal hide is soaked in tannin, mutual coagulation occurs resulting in the hardening of leather. (II) Rubber is obtained by coagulation of latex, which is a colloidal solution of rubber particles. (III) The styptic action of alum is due to the coagulation of blood forming a clot, which prevents further bleeding.

(A) (I) and (II)

(B) (II) and (III)

(D) (I), (II) and (III)

Option d – (I), (II) and (III)

The following statements are CORRECT, EXCEPT :

(A) Adsorption is accompanied by a decrease in entropy as well as a decrease in the enthalpy of the system.

(B) In adsorption, the concentration of the adsorbate is uniform throughout the bulk of the adsorbent.

(D) Adsorption is essentially a surface phenomenon.

Option b – In adsorption, the concentration of the adsorbate is uniform throughout the bulk of the adsorbent.

Which of the following is CORRECT?

(A) Cloud is an example of sol and froth is an example of foam.

(B) Cloud is an example of aerosol and froth is an example of foam.

(D) Cloud is an example of solid sol and froth is an example of aerosol.

Option b – Cloud is an example of aerosol and froth is an example of foam

Micelles are ……….

(A) multimolecular colloids

(B) associated colloids

(D) emulsions

Option b – associated colloids

The method used to remove charged impurities from colloids is ……….

(A) filtration

(B) peptization

(D) electrodialysis

Option d – electrodialysis

Animal charcoal is added to a solution of an organic dye. Then, the solution is well-shaken and filtered. The filtrate obtained is colorless. This is because ………

(A) the molecules of the dye are adsorbed by the charcoal

(B) the molecules of the dye are absorbed by the charcoal the molecules of the dye combine

(D) the molecules of the dye react with the charcoal to form colorless compounds

Option a – the molecules of the dye are adsorbed by the charcoal

In an electrophoresis experiment, the colloidal particles moved toward the negatively charged electrode. Which of the following sol will show such a movement of colloidal particles?

(A) TiO₂ sol

(B) CdS sol

(D) Sb₂S3 sol

Option a – TiO₂ sol

In how many of the following, the physical state of the dispersed phase is liquid? Paint, Hair cream, Mist, Foam rubber, Soap lather, Gemstones, Cell fluids

(A) 1

(B) 2

(D) 4

Option b – 2

In pumice stone, the dispersion medium is a ……… and the dispersed phase is a ……….

(A) gas; liquid

(B) solid; solid

(D) solid; gas

Option d – solid; gas

Which of the following is the most effective electrolyte to bring about the coagulation of a positively charged sol?

(A) Magnesium chloride

(B) Magnesium bromide

(D) Magnesium carbonate

Option d – Magnesium carbonate

The destruction of emulsions can be possible by all, EXCEPT by ………

(A) the addition of an emulsifier

(B) freezing

(D) heating

Option a – the addition of an emulsifier

Identify the INCORRECT statement.

(A) Lyophobic sols need stabilizing agents for their preservation.

(B) Lyophilic sols have the unique property of protecting lyophobic sols.

(D) Lyophobic sols can be prepared easily by mixing the dispersed phase with the dispersion medium.

Option d – Lyophobic sols can be prepared easily by mixing the dispersed phase with the dispersion medium.

Argyrol is a/an ……… sol used as an eye lotion.

(A) gold

(B) Silver

(D) antimony

Option b – Silver

ZSM-5 catalyst converts ……….

(A) alcohols to petrol

(B) alkenes to alkanes

(D) alkanes to alkenes

Option a – alcohols to petrol

Which of the following reactions does NOT represent heterogeneous catalysis?

(A) Hydrogenation of vegetable oil in the presence of nickel.

(B) Manufacture of ammonia by Haber’s process. in the

(D) Oxidation of sulphur dioxide into sulphur trioxide in the presence of platinum.

Option c – Hydrolysis of methyl acetate presence of hydrochloric acid.

The enzyme ……… converts starch to maltose.

(A) pepsin

(B) zymase

(D) trypsin

Option c – diastase

The Langmuir adsorption isotherm is deduced using which of the following assumptions?

(A) The adsorption is multilayered.

(B) The adsorption sites are equivalent in their ability to adsorb the particle.

(D) The adsorbed molecules interact with each other.

Option b – The adsorption sites are equivalent in their ability to adsorb the particle.

Identify the CORRECT statement.

(A) Aqueous solutions of proteins form multimolecular colloids.

(B) Depending on the physical state of the dispersed phase and dispersion medium, seven types of colloidal systems are possible.

(D) In lyophilic colloids, the particles of the dispersed phase have a great affinity for the dispersion medium.

Option d – In lyophilic colloids, the particles of the dispersed phase have a great affinity for the dispersion medium.

Delta formation at the junction where river water meets sea water is an example of ………

(A) peptization

(B) dialysis

(D) Brownian motion

Option c – coagulation

……… is an example of negatively charged sol.

(A) Blood

(B) Methylene blue sol

(D) Gum sol

Option d – Gum sol

Which of the following is CORRECT for hydrolysis of sucrose catalyzed by H ions furnished by sulphuric acid?

(A) Both the reactants and the catalyst are in the same phase.

(B) The reactants are in the liquid phase while the catalyst is in the solid state.

(D) Both the reactants and the catalyst are in the gaseous phase.

Option a – Both the reactants and the catalyst are in the same phase.

Which of the following statements is INCORRECT?

(A) Particles of colloidal solution scatter light.

(B) Particles of colloidal solution are invisible under an ordinary microscope.

(D) Particles of colloidal solution settle down rapidly due to gravity.

Option d – Particles of colloidal solution settle down rapidly due to gravity.

The sulphur sol is an example of ………. ( MCQ on Surface Chemistry )

(A) associated colloid

(B) lyophilic colloid

(D) macromolecular colloid

Option c – multimolecular colloid

In Haber’s process for the manufacture of NH3, …….. ( MCQ on Surface Chemistry )

(A) Mo acts as a catalyst and Fe acts as a promoter

(B) Fe acts as a catalyst and Mo acts as a promoter

(D) Fe acts as a promoter and Mo acts as an autocatalyst

Option b – Fe acts as a catalyst and Mo acts as a promoter

3 g of activated charcoal was added to 52 mL of acetic acid solution (0.06 M) in a flask. After an hour, it was filtered. The strength and the volume of the filtrate were found to be 0.045 M and 50 mL respectively. The amount of acetic acid adsorbed (per gram of charcoal) is ………

(A) 17.4 mg

(B) 34.8 mg

(D) 52.2 mg

Option a – 17.4 mg

Bredig’s arc method is ………. ( MCQ on Surface Chemistry )

(A) used in the purification of colloids

(B) used in the preparation of colloids

(D) used to study the Tyndall effect in colloids

Option b – used in the preparation of colloids

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