Which of the following will be the most effective in the coagulation of ${\rm{Fe}}{\left( {{\rm{OH}}} \right)_3}$ sol?

${\rm{M}}{{\rm{g}}_3}{\left( {{\rm{P}}{{\rm{O}}_4}} \right)_2}$

Precipitation of solid from colloidal dispersion

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JEE • CHEMISTRY • SURFACE CHEMISTRY

Surface chemistry practice · Easy

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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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61 Easy

61 of 128

Understanding +4 | -1

In a reversible reaction, a catalyst

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Correct option: C

Increases the rate of forward and backward reaction equally

Option C (Increases the rate of forward and backward reaction equally) is correct because a catalyst lowers the activation energy for both the forward and reverse reactions to the same extent, thus increasing the rate of both equally.

62 Easy

62 of 128

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Soaps are generally prepared from :

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Correct option: A

Linseed oil

Option A (Linseed oil) is correct because linseed oil is a common and relatively inexpensive oil used in soap making.

63 Easy

63 of 128

Remembering +4 | -1

The correct statement in case of milk

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Correct option: A

Milk is an emulsion of fat in water

Option A (Milk is an emulsion of fat in water) is correct because milk consists of fat droplets dispersed in a water-based solution.

64 Easy

64 of 128

Remembering +4 | -1

In physical adsorption gas molecules are bound on the solid surface by

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Correct option: D

Van der Waals’ forces

Option D is correct because in physical adsorption (physisorption), gas molecules are held on the solid surface by weak Van der Waals' forces.

65 Easy

65 of 128

Understanding +4 | -1

A dilute solution of litmus becomes colourless on shaking with charcoal. This is due to :

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Correct option: B

Adsorption

Option B (Adsorption) is correct because charcoal removes the color of litmus solution through adsorption, where litmus molecules adhere to the charcoal's surface.

66 Easy

66 of 128

Understanding +4 | -1

Point out the false statement

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Correct option: B

Colloidal solutions are homogeneous systems

Option B is correct because colloidal solutions are heterogeneous mixtures, not homogeneous.

67 Easy

67 of 128

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A catalytic poison is

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Correct option: D

An inhibitor

Option D (An inhibitor) is correct because a catalytic poison acts as an inhibitor, reducing or eliminating the activity of a catalyst.

68 Easy

68 of 128

Remembering +4 | -1

Decomposition of urea into

\mathrm{N}{\mathrm{H}_3}\;\mathrm{and}\;\mathrm{C}{\mathrm{O}_2}

is followed by the action of enzyme :

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Correct option: A

Urease

Option A (Urease) is correct because urease is the enzyme that catalyzes the hydrolysis of urea into ammonia and carbon dioxide.

69 Easy

69 of 128

Understanding +4 | -1

\mathrm{AlC}{\mathrm{l}_3}

in Friedel-Crafts reaction acts as :

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Correct option: C

Acid catalyst

Option C (Acid catalyst) is correct because AlCl3 acts as a Lewis acid to generate the electrophile in Friedel-Crafts reactions.

70 Easy

70 of 128

Application +4 | -1

Which of the following will be the most effective in the coagulation of

\mathrm{Fe}{\left( {\mathrm{OH}} \right)_3}

sol?

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Correct option: D

\mathrm{M}{\mathrm{g}_3}{\left( {\mathrm{P}{\mathrm{O}_4}} \right)_2}

Option D (

\mathrm{M}{\mathrm{g}_3}{\left( {\mathrm{P}{\mathrm{O}_4}} \right)_2}

) is correct because according to the Hardy-Schulze rule, ions with higher charges are more effective in coagulation, and

PO_4^{3-}

has the highest negative charge.

71 Easy

71 of 128

Remembering +4 | -1

The fresh precipitate can be transformed in colloidal state by

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Correct option: A

Peptization

Option A (Peptization) is correct because peptization is the process of converting a precipitate into a colloidal solution by adding a suitable electrolyte.

72 Easy

72 of 128

Understanding +4 | -1

The function of negative catalyst is :

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Correct option: C

Both (1) and (2)

Option C (Both (1) and (2)) is correct because negative catalysts can either remove active intermediates or terminate chain reactions.

73 Easy

73 of 128

Remembering +4 | -1

Cold cream is an example of

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Correct option: C

Water in oil emulsion

Option C (Water in oil emulsion) is correct because cold cream is a mixture where water droplets are dispersed in an oil phase.

74 Easy

74 of 128

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Which acts as negative catalyst?

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Correct option: D

All of the above

Option D (All of the above) is correct because lead tetraethyl, glycerol, and ethanol can all act as negative catalysts in specific reactions.

75 Easy

75 of 128

Remembering +4 | -1

A substance which promotes the activity of a catalyst is known as :

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Correct option: C

Promoter

Option C (Promoter) is correct because a promoter is a substance that enhances the activity of a catalyst.

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76 Easy

76 of 128

Remembering +4 | -1

Alloy is an example of

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Correct option: C

Solid solution

Option C (Solid solution) is correct because an alloy is a homogeneous mixture of two or more metals (or a metal and a non-metal) in the solid state.

77 Easy

77 of 128

Understanding +4 | -1

Whenever, gels are placed with their dispersed phase, they :

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Correct option: D

All of the above

Option D is correct. Gels swell up, intake the dispersed phase, and develop imbibition when placed with their dispersed phase.

78 Easy

78 of 128

Remembering +4 | -1

Which one of the following methods is commonly used for destruction of colloid?

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Correct option: D

By adding electrolyte

The correct answer is D (By adding electrolyte) because adding an electrolyte to a colloidal solution causes coagulation or precipitation of the colloid, leading to its destruction.

79 Easy

79 of 128

Understanding +4 | -1

Consider the following statements about Langmuir isotherm.

I. The free gas and adsorbed gas are in dynamic equilibrium.

II. All adsorption sites are equivalent.

III. The initially adsorbed layer can act as a substrate for further adsorption

IV. The ability of a molecule to get adsorbed at a given site is independent of the occupation of neighboring sites.

The correct statements are

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Correct option: B

I, II and IV

Option A (C < N > O) is correct because nitrogen has a higher ionization energy than both carbon and oxygen due to its half-filled p orbitals.

80 Easy

80 of 128

Understanding +4 | -1

Which of the following is the best protective colloid?

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Correct option: A

Gelatin (Gold no.=0.005)

Option A (Gelatin) is correct because the protective power of a colloid is inversely proportional to its gold number, and Gelatin has the lowest gold number (0.005) among the given options.

81 Easy

81 of 128

Remembering +4 | -1

Catalyst only

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Correct option: A

Decreases activation energy

Option A (Decreases activation energy) is correct because catalysts function by providing an alternative reaction pathway with a lower activation energy.

82 Easy

82 of 128

Remembering +4 | -1

An increase in the concentration of adsorbate at the surface relative to its concentration in bulk phase is called :

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Correct option: A

Adsorption

Option A (Adsorption) is correct because it is the definition of an increase in adsorbate concentration at the surface compared to the bulk phase.

83 Easy

83 of 128

Understanding +4 | -1

Removal of charge from colloids causes

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Correct option: B

Coagulation

Option B (Coagulation) is correct because removal of charge from colloids leads to their instability and aggregation, resulting in coagulation.

84 Easy

84 of 128

Remembering +4 | -1

Purple of cassius is

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Correct option: A

Colloidal solution of Au

Option A (Colloidal solution of Au) is correct because Purple of Cassius is a colloidal solution of gold nanoparticles, often used to impart a red or purple color to glass and ceramics.

85 Easy

85 of 128

Understanding +4 | -1

Which one of the following characteristics is associated with adsorption?

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Correct option: B

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

all are negative

Option B is correct because adsorption is an exothermic process (negative

\Delta H

), feasible (negative

\Delta G

), and involves a decrease in entropy (negative

\Delta S

86 Easy

86 of 128

Remembering +4 | -1

Which is kinetic phenomenon

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Correct option: A

Brownian motion

Option A (Brownian motion) is correct because Brownian motion is a kinetic phenomenon resulting from the random movement of particles.

87 Easy

87 of 128

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Peptization denotes

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Correct option: C

Breaking and dispersion into colloidal state

Option C (Breaking and dispersion into colloidal state) is correct because peptization is the process of converting a precipitate into a colloidal solution.

88 Easy

88 of 128

Remembering +4 | -1

Which does not show Tyndall effect?

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Correct option: D

Sugar solution

Option D (Sugar solution) is correct because sugar solution is a true solution and does not scatter light, therefore it does not show the Tyndall effect.

89 Easy

89 of 128

Remembering +4 | -1

The right option for the statement “Tyndall effect is exhibited by”, is:

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Correct option: A

Starch solution

Option A (Starch solution) is correct because the Tyndall effect is exhibited by colloidal solutions, and starch solution is a colloid.

90 Easy

90 of 128

Remembering +4 | -1

The substance that gets adsorbed on the surface of solid is called

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Correct option: A

Adsorbate

Option A (Adsorbate) is correct because the adsorbate is the substance that adheres to the surface of the adsorbent during adsorption.

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