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JEE • CHEMISTRY • SURFACE CHEMISTRY

Surface chemistry practice · Mixed difficulty

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Practice format and chapter quiz

These sets use single-correct-answer MCQs. They do not cover every JEE Main or JEE Advanced question format and are not full-length mock papers.

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Showing 1-30 of 213 questions
1 Easy
1 of 213
Understanding +4 | -1
Egg albumin is :
View answer and explanation
Correct option: D
All of these
Option D (All of these) is correct because egg albumin exhibits properties of reversible, lyophilic, and protective colloids.
2 Medium
2 of 213
Understanding +4 | -1
Alumns purify muddy water by
View answer and explanation
Correct option: D
Coagulation
Option D (Coagulation) is correct because alum causes the colloidal particles to clump together and settle down, purifying the water.
3 Easy
3 of 213
Understanding +4 | -1
Which of the following reaction is an example for homogeneous catalysis?
View answer and explanation
Correct option: C
2CO(g)+O2(g)→NO(g)2CO2(g)2\mathrm{CO}\left( \mathrm{g} \right) + {\mathrm{O}_2}\left( \mathrm{g} \right)\xrightarrow{{NO(g)}}2\mathrm{C}{\mathrm{O}_2}\left( \mathrm{g} \right)
Option C (2CO(g) + O2(g) ⟶NO(g) 2CO2(g)) is correct because in homogeneous catalysis, the catalyst and reactants are in the same phase, which is the gaseous phase in this case.
4 Easy
4 of 213
Understanding +4 | -1
Four gases, A, B, C and D have critical temperatures 5.3,33.2,126.05.3,33.2, 126.0 and 154.3K154.3 \mathrm{K} respectively
For their adsorption on a fixed amount of charcoal, the correct order is :
View answer and explanation
Correct option: C
D >> C >> B >> A
Option C is correct because the extent of adsorption is directly proportional to the critical temperature of the gas.
5 Medium
5 of 213
Understanding +4 | -1
Negatively charged sol is formed in peptisation of
View answer and explanation
Correct option: C
SnO2{SnO}_2 by NaOH{NaOH}
Option C (SnO2{SnO}_2 by NaOH{NaOH}) is correct because when SnO2{SnO}_2 is peptized by NaOH{NaOH}, the SnO32−SnO_3^{2-} ions are adsorbed on the surface of the SnO2{SnO}_2 particles, forming a negatively charged sol.
6 Easy
6 of 213
Understanding +4 | -1
Intensity of the scattered light depends on the difference between ______ of dispersed phase and dispersion medium
View answer and explanation
Correct option: B
Refractive indices
Option B is correct because the intensity of scattered light in colloids depends on the difference in refractive indices between the dispersed phase and the dispersion medium.
7 Easy
7 of 213
Remembering +4 | -1
Which of the following is an example of biochemical catalyst?
View answer and explanation
Correct option: C
Zymase
Option C (Zymase) is correct because Zymase is an enzyme complex that catalyzes the fermentation of sugar into ethanol and carbon dioxide.
8 Easy
8 of 213
Understanding +4 | -1
Gold numbers of protective colloids A,B,C  and  D,A,B,C\;and\;D, are 0.50, 0.01, 0.10, and 0.005, respectively. The correct order of their protective powers is
View answer and explanation
Correct option: C
A<C<B<DA < C < B < D
Option A (A<C<B<DA < C < B < D) is correct because the protective power of a colloid is inversely proportional to its gold number.
9 Medium
9 of 213
Understanding +4 | -1
The sol given below with negatively charge colloidal particles is
View answer and explanation
Correct option: C
AgNO3AgN{O_3} added to KlKl solution
Option C (AgNO3AgN{O_3} added to KlKl solution) is correct because the iodide ions get adsorbed on the surface of AgIAgI forming negatively charged colloids.
10 Medium
10 of 213
Remembering +4 | -1
A curve showing the variation of pressure with temperature for a given amount of adsorption is called
View answer and explanation
Correct option: C
Adsorption isoster
Option C (Adsorption isoster) is correct because an adsorption isoster represents the variation of pressure with temperature at a constant amount of adsorption.
11 Medium
11 of 213
Understanding +4 | -1
The isoelectric-point of a colloidally dispersed material is the pH\mathrm{pH} value at which
View answer and explanation
Correct option: B
the dispersed phase does not migrate in an electric field
Option B (the dispersed phase does not migrate in an electric field) is correct because the isoelectric point is the pH at which the net charge of the colloidal particles is zero, so they don't move in an electric field.
12 Medium
12 of 213
Understanding +4 | -1
The cause of Brownian movement is
View answer and explanation
Correct option: C
The impact of molecules of the dispersion medium on the colloidal particles.
Option C (The impact of molecules of the dispersion medium on the colloidal particles) is correct because Brownian movement is caused by the random collisions of the molecules of the dispersion medium with the colloidal particles.
13 Easy
13 of 213
Remembering +4 | -1
Which one is hydrophobic in nature?
View answer and explanation
Correct option: B
Sulphur
Option B (Sulphur) is correct because inorganic sols, like sulphur, are typically hydrophobic in nature.
14 Easy
14 of 213
Remembering +4 | -1
In whipped cream, the dispersed phase and dispersion medium respectively are
View answer and explanation
Correct option: B
Gas and liquid
Option B (Gas and liquid) is correct because whipped cream consists of gas bubbles (air) dispersed in a liquid (cream).
15 Easy
15 of 213
Remembering +4 | -1
Soap removes grease by :
View answer and explanation
Correct option: B
Emulsification
Option B (Emulsification) is correct because soap molecules surround grease particles, forming an emulsion that can be washed away with water.

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16 Medium
16 of 213
Remembering +4 | -1
Which of the following can reduce decomposition of H2O2\mathrm{H}_{2} \mathrm{O}_{2} on exposure to light
View answer and explanation
Correct option: A
Urea
Option A (Urea) is correct because urea acts as a negative catalyst, retarding the decomposition of hydrogen peroxide (H2O2H_2O_2) into water and oxygen upon exposure to light.
17 Easy
17 of 213
Remembering +4 | -1
Which type of metals form effective catalysts?
View answer and explanation
Correct option: B
Transition metals
Option B (Transition metals) is correct because transition metals have variable oxidation states and can form complexes, making them effective catalysts.
18 Medium
18 of 213
Understanding +4 | -1
Assertion : Alcohols are dehydrated to hydrocarbons in the presence of acidic zeolites.

Reason : Zeolites are porous catalysts.
View answer and explanation
Correct option: B
If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
Option B is correct because both the assertion and the reason are correct, but the reason does not explain the assertion. Zeolites are porous catalysts, but the dehydration of alcohols to hydrocarbons is due to their acidic nature.
19 Easy
19 of 213
Remembering +4 | -1
Enzyme are:
View answer and explanation
Correct option: B
Complex nitrogen compounds usually hydrolytic in nature
Option B (Complex nitrogen compounds usually hydrolytic in nature) is correct because enzymes are proteins, which are complex nitrogen-containing compounds, and they often catalyze hydrolytic reactions.
20 Medium
20 of 213
Remembering +4 | -1
The atoms present in cationic detergent can be
View answer and explanation
Correct option: C
C,H,N{C}, {H}, {N}
Option C (C,H,N{C}, {H}, {N}) is correct because cationic detergents typically contain a long hydrocarbon chain and a positively charged nitrogen atom.
21 Easy
21 of 213
Understanding +4 | -1
Which electrolyte is least effective in causing coagulation of +ve ferric hydroxide sol?
View answer and explanation
Correct option: A
KBr\mathrm{KBr}
Option A (KBr\mathrm{KBr}) is correct because bromide ions have the lowest charge and thus are least effective in coagulating a positive sol, according to the Hardy-Schulze rule.
22 Easy
22 of 213
Remembering +4 | -1
Which one of the following equation represents Freundlich adsorption isotherm?
View answer and explanation
Correct option: B
xm=kpn\frac{x}{m} = k{p^n}
Option B (xm=kpn\frac{x}{m} = k{p^n}) is correct because the Freundlich adsorption isotherm is represented by the equation xm=kpn\frac{x}{m} = k{p^n}.
23 Easy
23 of 213
Remembering +4 | -1
The phenomenon in which adsorption and absorption takes place simultaneously is called:
View answer and explanation
Correct option: B
Sorption
Option B (Sorption) is correct because sorption is the process where both adsorption and absorption occur simultaneously.
24 Medium
24 of 213
Application +4 | -1
Particles of a sol migrate towards cathode under influence of electric field. Which of the following has least flocculation value for coagulation of above mentioned sol?
View answer and explanation
Correct option: A
K4[Fe(CN)6]\mathrm{K}_4\left[\mathrm{Fe}(\mathrm{CN})_6\right]
Option A (K4[Fe(CN)6]\mathrm{K}_4[\mathrm{Fe}(\mathrm{CN})_6]) is correct because it has the highest charge anion, thus the least flocculation value for a positively charged sol.
25 Medium
25 of 213
Understanding +4 | -1
Among the following, the INCORRECT statement about colloids is :
View answer and explanation
Correct option: D
The osmotic pressure of a colloidal solution is of higher order than the true solution at the same concentration.
Option D is correct because the osmotic pressure of a colloidal solution is lower than that of a true solution at the same concentration due to the larger size and fewer number of colloidal particles.
26 Easy
26 of 213
Understanding +4 | -1
A particular adsorption process has the following characteristics :

(i) It arises due to van der Waal's forces and

(ii) it is reversile. Identify the correct statement that describes the above adsorption process :
View answer and explanation
Correct option: D
Energy of activation is low.
Option D (Energy of activation is low) is correct because physical adsorption, which arises due to van der Waal's forces, has a low activation energy.
27 Medium
27 of 213
Understanding +4 | -1
A freshly prepared Fe(OH)3\mathrm{Fe}(\mathrm{OH})_3 precipitate is peptised by adding FeCl3\mathrm{FeCl}_3 solution. The charge on the colloidal particles is due to the preferential adsorption of :
View answer and explanation
Correct option: B
Fe+3\mathrm{Fe}^{+3} ions
Option B is correct because during peptization of Fe(OH)3\mathrm{Fe(OH)}_3 with FeCl3\mathrm{FeCl}_3, the Fe3+\mathrm{Fe}^{3+} ions are preferentially adsorbed onto the precipitate, giving the colloidal particles a positive charge.
28 Medium
28 of 213
Application +4 | -1
On adding AgNO3AgN{O_3} solution to KIKI solution, a negatively charged colloidal solution will be formed in which of the following conditions?
View answer and explanation
Correct option: D
100mlof0.1M   AgNO3+100mlof0.15M KI          100\mathrm{ }ml\mathrm{ of }0.1\mathrm{ }M\;\,AgN{O_3} + \mathrm{ 10}0\mathrm{ }ml\mathrm{ of }0.15\mathrm{ }M\,KI\;\;\;\;\;
Option D (100mlof0.1M   AgNO3+100mlof0.15M KI100\mathrm{ }ml\mathrm{ of }0.1\mathrm{ }M\;\,AgN{O_3} + \mathrm{ 10}0\mathrm{ }ml\mathrm{ of }0.15\mathrm{ }M\,KI) is correct because excess KI will adsorb I−I^- ions, forming a negatively charged colloidal solution.
29 Medium
29 of 213
Understanding +4 | -1
Correct set of example of given type of colloid is
View answer and explanation
Correct option: C
Gel : Cheese
Option C (Gel : Cheese) is correct because cheese is a well-known example of a gel colloid.
30 Medium
30 of 213
Understanding +4 | -1
The Tyndall effect is observed only when following conditions are satisfied

1. The diameter of the dispersed particles is much smaller than the wavelength of the light used

2. The diameter of the dispersed particle is not much smaller than the wavelength of the light used

3. The refractive indices of the dispersed phase and dispersion medium are almost similar in magnitude

4. The refractive indices of the dispersed phase and dispersion medium differ greatly in magnitude
View answer and explanation
Correct option: B
2 and 4
Option B (2 and 4) is correct because the Tyndall effect requires the dispersed particle size to be comparable to the wavelength of light and a significant difference in refractive indices between the dispersed phase and the medium.
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