Among the electrolytes ${\rm{N}}{{\rm{a}}_2}{\rm{S}}{{\rm{O}}_4}{\rm{,CaC}}{{\rm{l}}_2}{\rm{,A}}{{\rm{l}}_2}{\left( {{\rm{S}}{{\rm{O}}_4}} \right)_3}\;{\rm{and}}\;{\rm{N}}{{\rm{H}}_4}{\rm{Cl}}$, the most effective coagulation agent for ${\rm{S}}{{\rm{b}}_2}{{\rm{S}}_3}$ sol is

${\rm{A}}{{\rm{l}}_2}{\left( {{\rm{S}}{{\rm{O}}_4}} \right)_3}$

${\rm{N}}{{\rm{a}}_2}{\rm{S}}{{\rm{O}}_4}$

${\rm{N}}{{\rm{H}}_4}{\rm{Cl}}$

Have general formula ${M_{x/n}}\left[ {{{\left( {{\rm{Al}}{{\rm{O}}_2}} \right)}_x}{{\left( {{\rm{Si}}{{\rm{O}}_2}} \right)}_4}} \right] \cdot m{{\rm{H}}_2}{\rm{O}}$

Have pore sizes between 260 pm to 740 pm

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NEET • CHEMISTRY • SURFACE CHEMISTRY

Surface chemistry practice · Mixed difficulty

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Showing 1-30 of 139 questions

1 Hard

1 of 139

Application +4 | -1

A cationic colloidal electrolyte forms micelle at

10^{-3} \mathrm{M}

concentration in water. Its

1 \mathrm{~mm}^3

solution contains

2 \times 10^{13}

micelle structures. What is the number of cations contained in one micelle? Take

\mathrm{N}_{\mathrm{A}}=6 \times 10^{23}

View answer and explanation

Correct option: A

Option A (30) is correct because it involves calculating the number of micelles and then dividing the total number of cations by the number of micelles.

2 Medium

2 of 139

Application +4 | -1

Graph between

\log \frac{{x}}{{m}}

and

\log {P}

is a straight line inclined at an angle

\theta=45^{\circ}

. When pressure is

0.5

atm and

\log {k}= 0.699,

the amount of solute adsorbed per

\mathrm{g}

of adsorbent will be:

View answer and explanation

Correct option: C

2.5 \mathrm{~g} / \mathrm{g}

adsorbent

Option C (2.5 g / g adsorbent) is correct because the amount of solute adsorbed per gram of adsorbent is calculated using the Freundlich isotherm equation.

3 Easy

3 of 139

Understanding +4 | -1

For adsorption of gas on solid surface, the plots of

\log \;x/m\mathrm{ } \;vs.

\log \;P

is linear with a slope equal to :

View answer and explanation

Correct option: D

\mathrm{l}/n

(

n

being integer)

Option D (

\mathrm{l}/n

(

n

being integer)) is correct because the Freundlich adsorption isotherm is represented by the equation

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

, and the slope of the plot of

\log \;x/m\mathrm{ } \;vs.

\log \;P

\frac{1}{n}

4 Hard

4 of 139

Understanding +4 | -1

Most suitable salt which can be used for efficient clotting of blood will be

View answer and explanation

Correct option: D

FeC{l_3}

Option D (

FeC{l_3}

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

Fe^{3+}

has a higher charge than

Fe^{2+}

Mg^{2+}

, or

Na^+

. Blood is a negatively charged sol, so a cation is needed.

5 Hard

5 of 139

Application +4 | -1

The density of gold is

19\;\mathrm{g/c}{\mathrm{m}^3}

. If

{1.9 \times {{10}^{ - 4}}\;\mathrm{g}}

of gold is dispersed in 1 L of water to give a sol having spherical gold particles of radius

10\;\mathrm{ }nm

, then the number of gold particles per

m{m^3}

of the sol will be

View answer and explanation

Correct option: D

2.4 \times {10^6}

Option D (

2.4 \times {10^6}

) is correct because it is calculated by finding the volume of a single gold particle, then the total number of particles, and finally the number of particles per unit volume.

6 Medium

6 of 139

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 for the same mass concentration, leading to lower colligative properties.

7 Medium

7 of 139

Remembering +4 | -1

Which of the following is a property of physisorption?

View answer and explanation

Correct option: C

Non-specificity

Option C (Non-specificity) is correct because physisorption involves weak van der Waals forces and does not require specific interactions between the adsorbate and adsorbent.

8 Medium

8 of 139

Remembering +4 | -1

The stabilization of a dispersed phase in a lyophobic colloid is due to

View answer and explanation

Correct option: C

The formation of an electrical layer between two phases

Option C (The formation of an electrical layer between two phases) is correct because the stabilization of lyophobic colloids is due to the electrical double layer formed at the interface.

9 Medium

9 of 139

Analyzing +4 | -1

Assertion (A): Ethyl Alcohol vapour is passed over anhydrous alumina as catalyst at

350^\circ C

acetaldehyde is obtained.
Reason (R): Emulsions contain liquid dispersed in liquid.

View answer and explanation

Correct option: D

(A) is false but (R) is true

Option D ((A) is false but (R) is true) is correct because the oxidation of ethyl alcohol to acetaldehyde requires a catalyst like copper at 573K, not alumina at 350°C, and emulsions are indeed liquid dispersed in liquid.

10 Easy

10 of 139

Application +4 | -1

Which of the following has maximum coagulation power with ferric hydroxide sol?

View answer and explanation

Correct option: D

{\mathrm{K}_4}\left[ {\mathrm{Fe}{{\left( {\mathrm{CN}} \right)}_6}} \right]

Option D (

{\mathrm{K}_4}[{\mathrm{Fe}{{\left( {\mathrm{CN}} \right)}_6}}])

is correct because, according to the Hardy-Schulze rule, the ion with the highest charge will have the maximum coagulation power.

[Fe(CN)_6]^{4-}

has the highest charge.

11 Medium

11 of 139

Application +4 | -1

A cube of

1 \mathrm{~m}

edge length is crushed in order to get small cubes of edge length

1 \mathrm{~mm}

. By which factor does the surface area increase?

View answer and explanation

Correct option: B

10^3

Option B (

10^3

) is correct because the surface area increases by a factor of 1000 when the cube is crushed into smaller cubes with 1/1000th the edge length.

12 Easy

12 of 139

Application +4 | -1

Among the electrolytes

\mathrm{N}{\mathrm{a}_2}\mathrm{S}{\mathrm{O}_4}\mathrm{,CaC}{\mathrm{l}_2}\mathrm{,A}{\mathrm{l}_2}{\left( {\mathrm{S}{\mathrm{O}_4}} \right)_3}\;\mathrm{and}\;\mathrm{N}{\mathrm{H}_4}\mathrm{Cl}

, the most effective coagulation agent for

\mathrm{S}{\mathrm{b}_2}{\mathrm{S}_3}

sol is

View answer and explanation

Correct option: C

\mathrm{A}{\mathrm{l}_2}{\left( {\mathrm{S}{\mathrm{O}_4}} \right)_3}

Option C (

\mathrm{A}{\mathrm{l}_2}{\left( {\mathrm{S}{\mathrm{O}_4}} \right)_3}

) is correct because, according to the Hardy-Schulze rule, the ion with the highest charge will be the most effective in coagulating a sol. Since

Sb_2S_3

is a negative sol, the cation with the highest charge (

Al^{3+}

) will be the most effective.

13 Medium

13 of 139

Remembering +4 | -1

Sulphur colloid is prepared by

View answer and explanation

Correct option: B

Oxidation

Option B (Oxidation) is correct because sulphur colloid is prepared by oxidizing hydrogen sulfide or other sulfur-containing compounds.

14 Medium

14 of 139

Remembering +4 | -1

An example of homogeneous catalysis is

View answer and explanation

Correct option: C

Lead chamber process

Option C is correct because the lead chamber process involves gaseous reactants and catalysts in the same phase, making it a homogeneous catalysis.

15 Hard

15 of 139

Application +4 | -1

10 mL of mM surfactant solution forms a monolayer covering

0.24\,\,c{m^2}

on a polar substrate. If the polar head is approximated as a cube, what is its edge length?

View answer and explanation

Correct option: A

2.0 pm

Option D (2.0 pm) is correct because it's calculated by finding the area occupied by one surfactant molecule and then taking the cube root to find the edge length.

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16 Medium

16 of 139

Remembering +4 | -1

The spontaneous outcome of internal liquid from gels is called :

View answer and explanation

Correct option: A

Synerisis

Option A is correct because syneresis is the spontaneous expulsion of liquid from a gel due to the contraction of the gel network.

17 Easy

17 of 139

Remembering +4 | -1

Zeolites :

View answer and explanation

Correct option: D

All of the above

The correct answer is D (All of the above) because zeolites are microporous aluminosilicates with a specific formula and pore sizes.

18 Easy

18 of 139

Remembering +4 | -1

Milk can be preserved by adding a few drops of :

View answer and explanation

Correct option: B

Formaldehyde solution

Option B (Formaldehyde solution) is correct because formaldehyde acts as a preservative by killing bacteria and preventing spoilage in milk.

19 Hard

19 of 139

Application +4 | -1

The coagulation of

100 \mathrm{~mL}

of a colloidal sol of gold is completely prevented by addition of 250

\mathrm{mg}

of a substance to it before adding

10 \mathrm{~mL}

1 \% \mathrm{NaCl}

solution. What is the gold number of this substance?

View answer and explanation

Correct option: A

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

20 Medium

20 of 139

Understanding +4 | -1

Which of the following is true in respect of adsorption?

View answer and explanation

Correct option: B

\Delta G < 0;\Delta S < 0;\Delta H < 0

Option B (

\Delta G < 0;\Delta S < 0;\Delta H < 0

) is correct because adsorption is a spontaneous process (

\Delta G < 0

) that decreases the randomness of the system (

\Delta S < 0

) and releases heat (

\Delta H < 0

21 Medium

21 of 139

Understanding +4 | -1

(x/m)

is the mass of adsorbate adsorbed per unit mass of adsorbent.

p

is the pressure of the adsorbate gas and

a

and

b

are constants, which of the following represents “Langmuir adsorption isotherm”?

View answer and explanation

Correct option: D

\frac{1}{{\left( {x/m} \right)}} = \frac{b}{a} + \frac{1}{{ap}}

Option D (

\frac{1}{{\left( {x/m} \right)}} = \frac{b}{a} + \frac{1}{{ap}}

) is correct because it represents the reciprocal form of the Langmuir adsorption isotherm equation.

22 Easy

22 of 139

Understanding +4 | -1

The rate of a certain biochemical reaction catalysed by an enzyme in human body is

{10^4}

times faster than when it carried out in the laboratory. The activation energy of this reaction :

View answer and explanation

Correct option: B

Is different in two cases

Option B (Is different in two cases) is correct because enzymes lower the activation energy significantly compared to the uncatalyzed reaction.

23 Easy

23 of 139

Application +4 | -1

Which is more powerful to coagulate the negative colloid?

View answer and explanation

Correct option: C

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

Option C (

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

) is correct because, according to the Hardy-Schulze rule, the ion with the highest charge will be the most effective in coagulating a negative colloid.

Al^{3+}

has the highest positive charge among the options.

24 Medium

24 of 139

Analyzing +4 | -1

The disperse phase in colloidal iron (III) hydroxide and colloidal gold is positively and negatively charged, respectively. Which of the following statements is not correct?

View answer and explanation

Correct option: C

Sodium sulphate solution causes coagulation in both sols

Option C is correct because sodium sulfate will coagulate the positively charged iron(III) hydroxide sol, but it will not coagulate the negatively charged gold sol.

25 Easy

25 of 139

Understanding +4 | -1

Which of the following is an example for heterogeneous catalysis reaction?

View answer and explanation

Correct option: D

Hydrolysis of liquid in the presence of aqueous mineral acid

Option C (

2{\mathrm{H}_2}{\mathrm{O}_2}\left( l \right)\xrightarrow{{pt(s)}}2{\mathrm{H}_2}\mathrm{O}\left( l \right) + {\mathrm{O}_2}\left( g \right)

) is correct because the catalyst (Pt) and reactants are in different phases.

26 Easy

26 of 139

Remembering +4 | -1

In a chemical reaction, catalyst

View answer and explanation

Correct option: A

Decrease the energy of activation

The correct answer is A (Decrease the energy of activation) because catalysts lower the activation energy of a reaction.

27 Medium

27 of 139

Understanding +4 | -1

For which of the given colloidal substances the dispersed phase and dispersion medium are in liquid state?

View answer and explanation

Correct option: A

Butter

Option A (Butter) is correct because butter is an emulsion where both the dispersed phase (fat) and the dispersion medium (water) are in the liquid state at room temperature.

28 Medium

28 of 139

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 (Reaction with higher activation energy has higher rate constant) is wrong because reactions with higher activation energy have *lower* rate constants, as they require more energy to proceed.

29 Medium

29 of 139

Application +4 | -1

Which of the following mixture will lead to the formation of negatively charged colloid

[AgI]{I^ - }

View answer and explanation

Correct option: B

50\,\mathrm{ml}\,\mathrm{of}\,0.1M\,AgN{O_3}\, + \,50\,\mathrm{ml}\,\mathrm{of}\,0.2M\,KI

Option B is correct because the excess of

I^-

ions from KI in the mixture leads to the adsorption of

I^-

on the AgI colloid, resulting in a negatively charged colloid.

30 Medium

30 of 139

Remembering +4 | -1

The correct option representing a Freundlich adsorption isotherm is

View answer and explanation

Correct option: A

\frac{x}{m}\, = \,K{p^{0.3}}

Option A (

\frac{x}{m}\, = \,K{p^{0.3}}

) is correct because the exponent of pressure in Freundlich isotherm lies between 0 and 1.

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Key Takeaways

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