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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 :

Incorrect statement for Tyndall effect is:

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.

\( 100 \, \text{mL} \) 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:

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

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.

Which of the following is a correct statement?

\( 2.0 \, \text{g} \) 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: \( R = 0.083 \, \text{L bar K}^{-1} \, \text{mol}^{-1} \) )

10.

Which of the following enhances the lathering property of soap?

11.

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 : \( \mathrm{Na} = 23.0 \, \text{g mol}^{-1} \); \( \mathrm{Cl} = 35.5 \, \text{g mol}^{-1} \).]

12.

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 __________ \( \text{g} \).

13.

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

14.

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

15.

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

16.

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:

17.

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:

18.

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

19.

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

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

20.

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 :

21.

Match List –I with List II

Choose the coorrect answer fform the options given below :

22.

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

23.

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:

24.

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 2022 28th July Evening shift

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

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JEE Mains JEE Advance BITSAT
JEE Mains | PYQ