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All years 2023 2022 2021

Using very little soap while washing clothes, does not serve the purpose of cleaning of clothes, because :

\( 20 \,\text{mL} \) of \( 0.5 \,\text{M} \) \( \text{NaCl} \) is required to coagulate \( 200 \,\text{mL} \) of \( \text{As}_2\text{S}_3 \) solution in \( 2 \) hours. The coagulating value of \( \text{NaCl} \) is __________.

The number of statement/s which are the characteristics of physisorption is _______ .
(A) It is highly specific in nature
(B) Enthalpy of adsorption is high
(C) It decreases with increase in temperature
(D) It results into unimolecular layer
(E) No activation energy is needed

Incorrect statement for Tyndall effect is:

Given below are two statement: one labelled as Assertion A and the other is labelled as Reason R.
Assertion A: \( \mathrm{SO_2(g)} \) is adsorbed to a larger extent than \( \mathrm{H_2(g)} \) on activated charcoal
Reason R: \( \mathrm{SO_2(g)} \) has a higher critical temperature than \( \mathrm{H_2(g)} \)
In the light of the above statements, choose the most appropriate answer from the options given below.

The zeta potential is related to which property of colloids?

Given below are two statements. One is labeled as Assertion and the other is labeled as Reason R.
Assertion A: Activated charcoal adsorbs \( \mathrm{SO_2} \) more efficiently than \( \mathrm{CH_4} \).
Reason R: Gases with lower critical temperatures are readily adsorbed by activated charcoal.
In the light of the above statements, choose the correct answer from the options.

Match List – I with List – II

Choose the most appropriate answer from the options given below:

Given below are two statements: one is labelled as Assertion (A) and the other labelled as Reason (R).
Assertion (A): In expensive scientific instruments, silica gel is kept in watch-glasses or in semipermeable membrane bags.
Reason (R): Silica gel adsorbs moisture from air via adsorption, thus protects the instrument from water corrosion (rusting) and / or prevents malfunctioning
In the light of the above statements, choose the correct from the options given below:

10.

Sodium stearate \( \mathrm{CH_3(CH_2)_{16}COO^-Na^+} \) is an anionic surfactant which forms micelles in Oil.
Choose the correct statement for it from the following:

11.

Match List I with List II

List - I	List - II
Example of Colloids	Classification
(a) Cheese	(i) dispersion of liquid in liquid
(b) Pumice stone	(ii) dispersion of liquid in gas
(c) Hair cream	(iii) dispersion of gas in solid
(d) Cloud	(iv) dispersion of liquid in solid

Choose the most appropriate answer from the options given below:

12.

\( 100 \, \text{ml} \) of \( 0.0018\% \) (w/v) solution of \( \text{Cl}^- \) ion was the minimum concentration of \( \text{Cl}^- \) required to precipitate a negative sol in one \( \text{h} \). The coagulating value of \( \text{Cl}^- \) ion is ___________. (Nearest integer)

13.

\( 100 \, \text{mL} \) of \( 5\% \) (w/v) solution of \( \mathrm{NaCl} \) in water was prepared in \( 250 \, \text{mL} \) beaker. Albumin from the egg was poured into \( \mathrm{NaCl} \) solution and stirred well. This resulted in a/an:

14.

Which of the following is NOT an example of synthetic detergent?

15.

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): The ionic radii of \( \mathrm{O^{2-}} \) and \( \mathrm{Mg^{2+}} \) are isoelectronic species.
In the light of the above statements, choose the correct answer from the options given below.

16.

When silver nitrate solution is added to potassium iodide solution then the sol produced is:

17.

The graph of \( \log \frac{x}{m} \) vs \( \log p \) for an adsorption process is a straight line inclined at an angle of \( 45^\circ \) with intercept equal to \( 0.6020 \). The mass of gas absorbed per unit mass of absorbent at the pressure of \( 0.4 \, \text{atm} \) is ______ \( \times 10^{-1} \) (Nearest integer). Given: \( \log 2 = 0.3010 \)

18.

Which one of the following is correct for the adsorption of a gas at a given temperature on a solid surface?

19.

Match List-I with List-II:

Choose the most appropriate answer from the options given below:

20.

Which of the following is a correct statement?

21.

\( 2.0 \, \text{g} \) of \( \mathrm{H_2} \) gas is adsorbed on \( 2.5 \, \text{g} \) of platinum powder at \( 300 \, \text{K} \) and \( 1 \, \text{bar} \) pressure. The volume of the gas adsorbed per gram of the adsorbent is ___________ \( \text{mL} \). (Given: \( R = 0.083 \, \text{L bar K}^{-1} \, \text{mol}^{-1} \) )

22.

Which of the following enhances the lathering property of soap?

23.

A \( 42.12\% \) (\( \text{w/v} \)) solution of \( \mathrm{NaCl} \) causes precipitation of a certain sol in \( 10 \) hours. The coagulating value of \( \mathrm{NaCl} \) for the sol is:
[Given: Molar mass : \( \mathrm{Na} = 23.0 \, \text{g mol}^{-1} \); \( \mathrm{Cl} = 35.5 \, \text{g mol}^{-1} \).]

24.

Match List I with List II:

Choose the correct answer from the options given below:

25.

The charges on the colloidal CdS sol and \(\text{TiO}_2\) sol are, respectively.

26.

When \( 200 \, \text{mL} \) of \( 0.2 \, \text{M} \) acetic acid is shaken with \( 0.6 \, \text{g} \) of wookd charcoal, the final concentration of acetic acid after adsorption is \( 0.1 \, \text{M} \). The mass of acetic acid adsorbed per gram of carbon is __________ \( \text{g} \).

27.

Statements about Enzyme Inhibitor Drugs are given below:
(a) There are Competitive and Non-competitive inhibitor drugs.
(b) These can bind at the active sites and allosteric sites
(c) Competitive Drugs are allosteric site blocking drugs
(d) Non-competitive Drugs are active site blocking drugs

28.

The INCORRECT statements below regarding colloidal solutions is:

29.

In figure, a straight line is given for Freundlich Adsorption \( (y = 3x + 2.505) \). The value of \( \frac{1}{n} \) and \( \log K \) are respectively.

30.

Stearic acid and polyethylene glycol react to form which one of the following soap/s detergents?

31.

Select the graph that correctly describes the adsorption isotherms at two temperatures \( T_1 \) and \( T_2 \) (\( T_1 > T_2 \)) for a gas:
(\( x \) – mass of the gas adsorbed, \( m \)- mass of adsorbent, \( P \)-pressure)

32.

For the coagulation of a negative sol, the species below, that has the highest flocculating power is :

33.

Coagulating value of the electrolytes \( \mathrm{AlCl_3} \) and \( \mathrm{NaCl} \) for \( \mathrm{As_2S_3} \) are \( 0.09 \) and \( 50.04 \) respectively. The coagulating power of \( \mathrm{AlCl_3} \) is \( x \) times the coagulating power of \( \mathrm{NaCl} \). The value of \( x \) is _________.

34.

The variation of the rate of an enzyme catalyzed reaction with substrate concentration is correctly represented by graph.

35.

Which of the following salt solutions would coagulate the colloid solution formed when \( \mathrm{FeCl_3} \) is added to \( \mathrm{NaOH} \) solution, at the fastest rate?

36.

Match List I with List II

LIST I - Enzymatic reaction	LIST II - Enzyme
A. Sucrose \( \rightarrow \) Glucose and Fructose	I. Zymase
B. Glucose \( \rightarrow \) ethyl alcohol and \( \text{CO}_2 \)	II. Pepsin
C. Starch \( \rightarrow \) Maltose	III. Invertase
D. Proteins \( \rightarrow \) Ammo acids	IV. Diastase

Choose the correct answer from the options given below:

37.

If the initial pressure of a gas is \( 0.03 \, \mathrm{atm} \), the mass of the gas adsorbed per gram of the adsorbent is ______ \( \times 10^{-2} \, \mathrm{g} \).

38.

Two statements in respect of drug-enzyme interaction are given below.
Statement I: Action of an enzyme can be blocked only when an inhibitor blocks the active site of the enzyme.
Statement II: An inhibitor can form a strong covalent bond with the enzyme.
In the light of the above statements, choose the correct answer from the options given below:

39.

What happens when a lyophilic sol is added to a lyophobic sol?

40.

\( \mathrm{CH}_4 \) is adsorbed on \( 1 \, \text{g} \) charcoal at \( 0^\circ \text{C} \) following the Freundlich adsorption isotherm. \( 10.0 \, \text{mL} \) of \( \mathrm{CH}_4 \) is adsorbed at \( 100 \, \text{mm} \) of Hg, whereas \( 15.0 \, \text{mL} \) is adsorbed at \( 200 \, \text{mm} \) of Hg. The volume of \( \mathrm{CH}_4 \) adsorbed at \( 300 \, \text{mm} \) of Hg is \( 10^{x} \, \text{mL} \). The value of \( x \) is _______ \( \times 10^{-2} \). (Nearest integer) (Use \( \log_{10} 2 = 0.3010 \), \( \log_{10} 3 = 0.4771 \))

41.

\( \mathrm{CO_2} \) gas adsorbs on charcoal following Freundlich adsorption isotherm. For a given amount of charcoal, the mass of \( \mathrm{CO_2} \) adsorbed becomes \( 64 \) times when the pressure of \( \mathrm{CO_2} \) is doubled. The value of \( n \) in the Freundlich isotherm equation is ______ \( \times 10^{-2} \). (Round off to the Nearest Integer)

42.

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: Finest gold is red in colour, as the size of the particles increases, it appears purple then blue and finally gold.
Reason R: The colour of the colloidal solution depends on the wavelength of light scattered by the dispersed particles.
In the light of the above statements, choose the most appropriate answer from the options given below:

43.

Among the following the number of curves not in accordance with Freundlich adsorption isotherm is _______.

44.

The sol given below with negatively charged colloidal particles is:

45.

Which of the following represent the Freundlich adsorption isotherms?

Choosethe correct answer from the options given below:

46.

Tyndall effect is more effectively shown by:

47.

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

48.

Match List I and List II

Choose the correct answer from the options given below:

49.

Given below are the critical temperatures of some of the gases:

The gas showing least adsorption on a definite amount of charcoal is

50.

Among the following, the number of compounds which will give positive iodoform reaction is ________ .
(a) \( 1 \)-Phenylbutan-\( 2 \)-one
(b) \( 2 \)-Methylbutan-\( 2 \)-ol
(c) \( 3 \)-Methylbutan-\( 2 \)-ol
(d) \( 1 \)-Phenylethanol
(e) \( 3, \, 3 \)-dimethylbutan-\( 2 \)-one
(f) \( 1 \)-Phenylpropan-\( 2 \)-ol

51.

The number of incorrect statement/s from the following is/are _______.

A. Water vapours are adsorbed by anhydrous calcium chloride.

B. There is a decrease in surface energy during adsorption.

C. As the adsorption proceeds, \( \Delta H \) becomes more and more negative.

D. Adsorption is accompanied by decrease in entropy of the system.

52.

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: The diameter of colloidal particles in solution should not be much smaller than wavelength of light to show Tyndall effect.
Reason R: The light scatters in all directions when the size of particles is large enough.
In the light of the above statements, choose the correct answer from the options given below:

53.

Adding surfactants in non – polar solvent, the micelles structure will look like:

54.

Four gases A, B, C and D have critical temperatures \( 5.3 \), \( 33.2 \), \( 126.0 \) and \( 154.3 \, \text{K} \) respectively.
For their adsorption on a fixed amount of charcoal, the correct order is:

55.

The enthalpy change for the adsorption process and micelle formation respectively are:

56.

The number of correct statement about modern adsorption theory of heterogeneous catalysis from the following is _______.
A. The catalyst is diffused over the surface of reactants
B. Reactants are adsorbed on the surface of the catalyst
C. Occurrence of chemical reaction on the catalyst’s surface through formation of an intermediate
D. It is combination of intermediate compound formation theory and the old adsorption theory
E. It explains the action of the catalyst as well as those of catalytic promoters and poisons

57.

The conditions given below are in the context of observing Tyndall effect in colloidal solutions:
(A) The diameter of the colloidal particles is comparable to the wavelength of light used.
(B) The diameter of the colloidal particles is much smaller than the wavelength of light used
(C) The diameter of the colloidal particles is much larger than the wavelength of light used.
(D) The refractive indices of the dispersed phase and the dispersion medium are comparable.
(E) The disperse phase has a very different refractive index from the dispersion medium.
Choose the most appropriate conditions from the options given below.

58.

Lyophilic sols are more stable than lyophobic sols because :

59.

A colloidal system consisting of a gas dispersed in a solid is called a/an :

60.

Match Column I with Column II

Column I	Column II
I. \( \mathrm{N_2(g)} + 3\mathrm{H_2(g)} \rightarrow 2\mathrm{NH_3(g)} \)	P. Cu
II. \( \mathrm{CO(g)} + 3\mathrm{H_2(g)} \rightarrow \mathrm{CH_4(g)} + \mathrm{H_2O(g)} \)	Q. Cu / ZnO − \( \mathrm{Cr_2O_3} \)
III. \( \mathrm{CO(g)} + \mathrm{H_2(g)} \rightarrow \mathrm{HCHO(g)} \)	R. \(\text{Fe}_x\text{O}_y + \text{K}_2\text{O} + \text{Al}_2\text{O}_3\)
IV. \( \mathrm{CO(g)} + 2\mathrm{H_2(g)} \rightarrow \mathrm{CH_3OH(g)} \)	S. Ni

Choose the correct answer from the option given below :

61.

Match List –I with List II

Choose the coorrect answer fform the options given below :

62.

Ferric chloride is applied to stop bleeding because:

63.

For micelle formation, which of the following statements are correct?
A. Micelle formation is an exothermic process
B. Micelle formation is an endothermic process
C. The entropy change is positive
D. The entropy change is negative

64.

Given below are two statements:
Statement I : Emulsions of oil in water are unstable and sometimes they separate into two layers on standing.
Statement II : For stabilisation of an emulsion, excess of electrolyte is added. In the light of the above statements, choose the most appropriate answer from the options given below:

65.

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason(R).
Assertion (A) : Dissolved substance can be removed from a colloidal particles can pass through the parchment paper.
Reason(R): Particle in a true solution cannot pass through parchment paper but the colloidal particles can pass through the parchment paper.
In the light of the above statements, choose the correct answer from the options given below:

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JEE Main 2021 27th August Morning Shift

Tyndall effect is more effectively shown by:

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