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JEE • CHEMISTRY • SURFACE CHEMISTRY

Surface chemistry practice · Medium

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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 31-60 of 83 questions

31 Medium

31 of 83

Understanding +4 | -1

Assertion (A): The moist air becomes dry in silica gel.

Reason (R): Water molecules gets absorbed on silica gel.

View answer and explanation

Correct option: C

(A) is true but (R) is false

Option C ((A) is true but (R) is false) is correct because silica gel dries moist air through adsorption, not absorption. Adsorption is a surface phenomenon, while absorption involves penetration into the bulk.

32 Medium

32 of 83

Remembering +4 | -1

Vanishing cream is an example of

View answer and explanation

Correct option: D

Emulsion

Option D (Emulsion) is correct because vanishing cream is an example of an emulsion, specifically an oil-in-water emulsion.

33 Medium

33 of 83

Remembering +4 | -1

Example of negatively charged sol is

View answer and explanation

Correct option: A

Gold sol

Option A (Gold sol) is correct because gold sols are typically negatively charged due to the adsorption of hydroxide ions or other negative ions on the gold surface.

34 Medium

34 of 83

Remembering +4 | -1

The Langmuir adsorption isotherm is deduced using the assumption

View answer and explanation

Correct option: A

The adsorption sites are equivalent in their ability to adsorb the particles

Option A (The adsorption sites are equivalent in their ability to adsorb the particles) is correct because this is a fundamental assumption in the Langmuir adsorption isotherm model.

35 Medium

35 of 83

Remembering +4 | -1

The process of removing dissolved impurities from a colloidal system by means of diffusion through suitable membrane under the influence of an electric filed is called

View answer and explanation

Correct option: B

Electro-dialysis

Option B (Electro-dialysis) is correct because electro-dialysis is the process of removing dissolved impurities from a colloidal system using a suitable membrane under the influence of an electric field.

36 Medium

36 of 83

Understanding +4 | -1

On addition of 1mL solution of 10% NaCl to 10mL gold solution in the presence of

0.025\;g

of starch, the coagulation is prevented because starch has the following gold numbers

View answer and explanation

Correct option: A

Option A (25) is correct because the gold number is defined as the amount of protective colloid in milligrams that prevents coagulation of 10 mL of gold solution by 1 mL of 10% NaCl solution.

37 Medium

37 of 83

Remembering +4 | -1

Size of colloidal particle ranges between

View answer and explanation

Correct option: B

1 {~nm}

1000 {~nm}

Option B (

1 {~nm}

1000 {~nm}

) is correct because this is the defined size range for colloidal particles.

38 Medium

38 of 83

Understanding +4 | -1

Which statement is wrong?

View answer and explanation

Correct option: B

Reaction with higher activation energy has higher rate constant

Option B is correct because a higher activation energy implies a slower reaction rate, hence a smaller rate constant, according to the Arrhenius equation.

39 Medium

39 of 83

Understanding +4 | -1

Which of the following is incorrect for an emulsion:

View answer and explanation

Correct option: C

The droplets in emulsion are often positively charged

Option C (The droplets in emulsion are often positively charged) is correct because emulsion droplets are generally negatively charged due to preferential adsorption of negatively charged ions.

40 Medium

40 of 83

Application +4 | -1

The number of moles of lead nitrate needed to coagulate 2 mole of colloidal

\left[ {Ag\,I} \right]{I^ - }

View answer and explanation

Correct option: B

Option B (1) is correct because 1 mole of lead nitrate (

Pb^{2+}

) is required to coagulate 2 moles of colloidal

[AgI]I^-

41 Medium

41 of 83

Remembering +4 | -1

Zeolites are used as catalyst in

View answer and explanation

Correct option: A

Petrochemical industries during cracking

Option A (Petrochemical industries during cracking) is correct because zeolites are commonly used as catalysts in cracking processes within the petrochemical industry.

42 Medium

42 of 83

Understanding +4 | -1

Amount of gas adsorbed per gram of adsorbent increases with pressure, but after certain limit is reached, adsorption becomes constant. It is where

View answer and explanation

Correct option: A

Multilayers are formed

Option A (Multilayers are formed) is correct because after a certain limit, the adsorbent surface is covered, and further adsorption leads to multilayer formation.

43 Medium

43 of 83

Application +4 | -1

Which of the following will form positively charged colloidal solution?

View answer and explanation

Correct option: B

100\,ml\,\,0.2\,M\,AgN{O_3} + 100\,ml\,\,0.1\,M\,KI

Option B (

100\,ml\,\,0.2\,M\,AgN{O_3} + 100\,ml\,\,0.1\,M\,KI

) is correct because an excess of

AgNO_3

leads to the adsorption of

Ag^+

ions, resulting in a positively charged colloid.

44 Medium

44 of 83

Application +4 | -1

The coagulation of

10\;\mathrm{c}{\mathrm{m}^3}

of gold sol is completely prevented by addition of

0.025\;\mathrm{g}

of starch to it. The gold number of starch is

View answer and explanation

Correct option: D

Option D (25) is correct because the gold number is defined as the amount of protective colloid in milligrams required to prevent coagulation of 10 cm³ of gold sol.

45 Medium

45 of 83

Remembering +4 | -1

Reducing fog is mixture of

View answer and explanation

Correct option: B

Smoke, fog and

\mathrm{S}{\mathrm{O}_\mathrm{2}}

Option B (Smoke, fog and

\mathrm{S}{\mathrm{O}_{\mathrm{2}}}

) is correct because reducing smog is a mixture of smoke, fog, and sulfur dioxide.

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46 Medium

46 of 83

Remembering +4 | -1

Haemoglobin and gold sol are examples of

View answer and explanation

Correct option: D

Positively and negatively charged sols, respectively

Option D (Positively and negatively charged sols, respectively) is correct because hemoglobin is a positively charged sol, while gold sol is a negatively charged sol.

47 Medium

47 of 83

Remembering +4 | -1

Pumice stone is an example of

View answer and explanation

Correct option: A

Solid sol

Option A (Solid sol) is correct because pumice stone is a solid with gas dispersed within its solid matrix, which defines a solid sol.

48 Medium

48 of 83

Remembering +4 | -1

The spontaneous outcome of internal liquid from gels is called :

View answer and explanation

Correct option: A

Synerisis

Option A (Synerisis) is correct because synerisis is the process where a gel contracts and exudes liquid.

49 Medium

49 of 83

Understanding +4 | -1

Which one of the following characteristics is associated with adsorption

View answer and explanation

Correct option: D

\Delta G,\,\Delta H\,\mathrm{and}\,\Delta S

all are negative

Option D (

\Delta G,\,\Delta H\,\mathrm{and}\,\Delta S

all are negative) is correct because adsorption is an exothermic process (

\Delta H

is negative) that decreases randomness (

\Delta S

is negative), and it is spontaneous (

\Delta G

is negative).

50 Medium

50 of 83

Understanding +4 | -1

{AgNO}_3

added to excess of

{KI}

solution the colloidal sol obtained will be

View answer and explanation

Correct option: A

{AgI} / {I}^{-}

Option A (

{AgI} / {I}^{-}

) is correct because when

AgNO_3

is added to excess

KI

AgI

precipitates and adsorbs

I^-

ions, forming a negatively charged colloidal sol.

51 Medium

51 of 83

Understanding +4 | -1

Assertion: Barbers rub the face with alum stones after giving a shave.

Reason: Alum stones have antiseptic properties.

View answer and explanation

Correct option: C

Assertion is correct, but reason is wrong statement.

Option C is correct because barbers use alum to constrict blood vessels and stop bleeding after a shave, but alum's primary function isn't antiseptic.

52 Medium

52 of 83

Understanding +4 | -1

When temperature is increased

View answer and explanation

Correct option: B

Extent of adsorption decreases in physisorption

Option B is correct because physisorption is an exothermic process, and according to Le Chatelier's principle, increasing the temperature will decrease the extent of adsorption.

53 Medium

53 of 83

Understanding +4 | -1

Adsorption is accompanied by

View answer and explanation

Correct option: D

All of the above

Option D (All of the above) is correct because adsorption is an exothermic process that decreases the randomness of the system, leading to a negative change in entropy and enthalpy.

54 Medium

54 of 83

Understanding +4 | -1

The magnitude of colligative properties in all colloidal dispersions is …..than solution :

View answer and explanation

Correct option: B

Lower

Option B (Lower) is correct because colloidal dispersions have fewer particles than true solutions, leading to smaller colligative properties.

55 Medium

55 of 83

Understanding +4 | -1

According to Freundlich adsorption isotherm, which of the following is correct?

View answer and explanation

Correct option: D

All the above are correct for different ranges of pressure

Option D (All the above are correct for different ranges of pressure) is correct because the Freundlich isotherm equation

\frac{x}{m} = kP^{1/n}

can simplify to

\frac{x}{m} \propto P^1

at low pressure and

\frac{x}{m} \propto P^0

at high pressure.

56 Medium

56 of 83

Understanding +4 | -1

Which of the following exhibits greater coagulation power towards a negative colloid?

View answer and explanation

Correct option: C

\mathrm{AlCl}_3

Option C (

\mathrm{AlCl}_3

) is correct because, according to the Hardy-Schulze rule, ions with higher charges have greater coagulating power, and

Al^{3+}

has the highest charge among the given options.

57 Medium

57 of 83

Understanding +4 | -1

\mathrm{As}_2 \mathrm{~S}_3

sol is most easily precipitated by which ion?

View answer and explanation

Correct option: A

\mathrm{Al}^{3 +}

Option A (

\mathrm{Al}^{3 +}

) is correct because according to the Hardy-Schulze rule, ions with higher charges are more effective at causing flocculation.

58 Medium

58 of 83

Remembering +4 | -1

Physical states of dispersed phase and dispersion medium in gel respectively are

View answer and explanation

Correct option: C

Liquid and solid

Option C (Liquid and solid) is correct because in a gel, the dispersed phase is a liquid and the dispersion medium is a solid.

59 Medium

59 of 83

Remembering +4 | -1

Butter is an example of

View answer and explanation

Correct option: D

Emulsion

Option D (Emulsion) is correct because butter is a mixture of two immiscible liquids (fat and water).

60 Medium

60 of 83

Understanding +4 | -1

On which of the following properties does the coagulating power of an ion depend ?

View answer and explanation

Correct option: C

Both magnitude and sign of the charge on the ion

Option C (Both magnitude and sign of the charge on the ion) is correct because the coagulating power of an ion depends on both its charge and its sign, as per the Hardy-Schulze rule.

Revision notes and key takeaways

Review SURFACE CHEMISTRY in your textbook or class notes, then use this set to check your understanding.

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