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JEE • CHEMISTRY • SOLUTIONS

Solutions practice · Easy

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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 1-30 of 118 questions

1 Easy

1 of 118

Application +4 | -1

Equal masses of two aqueous solutions, one of

3.6 \, \mathrm{g}

glucose per

100 \mathrm{~g}

of water and the other of

3.6 \mathrm{~g}

urea per

100 \mathrm{~g}

of water are mixed. If the freezing point of resulting solution is

-x^{\circ} \mathrm{C},

then the value of '

1000 x

' is

\left(K_{\mathrm{f}}\right.

of water

\left.=1.86\right)

View answer and explanation

Correct option: A

744

Option A (744) is correct because it calculates the freezing point depression of the mixed solution and multiplies by 1000.

2 Easy

2 of 118

Application +4 | -1

The values of observed and calculated molecular weights of silver nitrate are 92.64 and 170 respectively. The degree of dissociation of silver nitrate is :

View answer and explanation

Correct option: B

83.5\%

Option B (

83.5\%

) is correct because it calculates the degree of dissociation using the observed and calculated molecular weights.

3 Easy

3 of 118

Remembering +4 | -1

The molal elevation/depression constant depends upon :

View answer and explanation

Correct option: A

Nature of solvent

Option A (Nature of solvent) is correct because the molal elevation/depression constant is a colligative property that depends only on the solvent.

4 Easy

4 of 118

Remembering +4 | -1

The temperature at which vapour pressure of a solvent in its liquid and solid phase becomes same is called :

View answer and explanation

Correct option: B

f. p.

Option B (f. p.) is correct because the freezing point is defined as the temperature at which the vapor pressure of the liquid and solid phases of a solvent are equal.

5 Easy

5 of 118

Analyzing +4 | -1

Assertion (A) Osmotic pressure of

0.1\, {~N}

urea solution is less than that of

0.1 \,{M}\,{NaCl}

solution.

Reason (R) Osmotic pressure is not a colligative property.

View answer and explanation

Correct option: C

If Assertion is true but Reason is false.

Option C (If Assertion is true but Reason is false) is correct because osmotic pressure is a colligative property, and the assertion about urea and NaCl is correct.

6 Easy

6 of 118

Understanding +4 | -1

Osmotic pressure observed when benzoic acid is dissolved in benzene is less than that expected from theoretical considerations. This is because:

View answer and explanation

Correct option: C

Benzoic acid gets associated in benzene

Option C (Benzoic acid gets associated in benzene) is correct because association of benzoic acid reduces the number of particles in solution, thus lowering the observed osmotic pressure.

7 Easy

7 of 118

Understanding +4 | -1

The molar solution of sulphuric acid is equal to

View answer and explanation

Correct option: B

2 N

solution

Option B (

2 N

solution) is correct because sulfuric acid (

H_2SO_4

) is a diprotic acid, meaning it has two replaceable hydrogen ions, so its normality is twice its molarity.

8 Easy

8 of 118

Understanding +4 | -1

The solubility order for the following gases is :

View answer and explanation

Correct option: A

\mathrm{N}{\mathrm{H}_3} > C{\mathrm{O}_2} > {\mathrm{O}_2} > {\mathrm{H}_2}

Option A (

\mathrm{N}{\mathrm{H}_3} > C{\mathrm{O}_2} > {\mathrm{O}_2} > {\mathrm{H}_2}

) is correct because ammonia is highly soluble due to hydrogen bonding, followed by CO2 which reacts with water, then oxygen, and lastly hydrogen.

9 Easy

9 of 118

Analyzing +4 | -1

Assertion (A) : Formation of semipermeable membrane between the walls of porous pot on hanging pot filled with

\mathrm{CuSO}_4(a q)

partially dipped in

\mathrm{K}_4 \mathrm{Fe}(\mathrm{CN})_6

is due to osmosis.

Reason (R) : The ions moves through the walls of porous pot and between the walls

\mathrm{Cu}^{2+}

and

\mathrm{Fe}(\mathrm{CN})_6^{4-}

gives insoluble gelatinous mass of

\mathrm{Ca}_2\left[\mathrm{Fe}(\mathrm{CN})_6\right]_4

View answer and explanation

Correct option: B

Assertion is Wrong but Reason is correct

The correct answer is Assertion is Wrong but Reason is correct. The formation of a semipermeable membrane is due to diffusion, not osmosis, and the reaction between Cu2+ and Fe(CN)64- forms an insoluble compound.

10 Easy

10 of 118

Remembering +4 | -1

Temperature coefficient is the variation in the :

View answer and explanation

Correct option: D

Distribution coefficient for

{\mathrm{10^\circ }}

rise in the temperature

Option D (Distribution coefficient for

{\mathrm{10^\circ }}

rise in the temperature) is correct because the temperature coefficient describes the change in the distribution coefficient for a 10-degree Celsius temperature increase.

11 Easy

11 of 118

Application +4 | -1

Which of the following statements about the composition of the vapour over an ideal

1:1

molar mixture of benzene and toluene is correct? Assume that the temperature is constant at

{25^\mathrm{o}}C

. (Given vapour pressure data at

{25^\mathrm{o}}C

\mathrm{benzene}\,\mathrm{ = }\,\mathrm{12}\mathrm{.8}\,\mathrm{kPa,}\,\mathrm{toluene}\,\mathrm{ = }\,\mathrm{3}\mathrm{.85}\,\mathrm{kPa}

)

View answer and explanation

Correct option: A

The vapour will contain a higher percentage of benzene.

The correct answer is A because benzene has a higher vapor pressure than toluene, so the vapor will be richer in benzene.

12 Easy

12 of 118

Analyzing +4 | -1

Dimer of acetic acid in liquid benzene is in equilibrium with acetic acid monomer at certain temperature and pressure. If

25 \%

of the dimer molecules are separated out then

View answer and explanation

Correct option: B

Average molar mass of solute increases

Option B is correct because if the dimer separates out, the effective van't Hoff factor decreases, leading to an increase in the observed molar mass of the solute.

13 Easy

13 of 118

Application +4 | -1

The amount of urea dissolved in 500 cc of water

({K_f} = 1.86^\circ C)

to produce a depression of

0.186^\circ C

in the freezing point is

View answer and explanation

Correct option: C

3 g

Option C (3 g) is correct because the mass of urea is calculated using the formula for depression in freezing point, considering the molality and cryoscopic constant.

14 Easy

14 of 118

Understanding +4 | -1

Which mixture is immiscible?

View answer and explanation

Correct option: A

{C}_5 {H}_{12}+

alcohol

Option A (

{C}_5 {H}_{12}+

alcohol) is immiscible because pentane is a nonpolar solvent, while alcohols, especially short-chain alcohols, have some polarity due to the -OH group.

15 Easy

15 of 118

Understanding +4 | -1

A semipermeable membrane used in the measurement of osmotic pressure of a solution allows the passage of:

View answer and explanation

Correct option: A

solute molecules through it

Option B (solvent molecules through it) is correct because a semipermeable membrane allows only solvent molecules to pass through, preventing the passage of solute molecules.

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16 Easy

16 of 118

Understanding +4 | -1

Which of the following is not an example of a solution?

View answer and explanation

Correct option: D

Benzene in water

Option D (Benzene in water) is correct because benzene and water are immiscible, forming a heterogeneous mixture, not a homogeneous solution.

17 Easy

17 of 118

Application +4 | -1

How many gram of glucose must be present in

0.5 \mathrm{~L}

of solution for its osmotic pressure to be the same as that of

9.2 \mathrm{~g}

of glucose per litre?

View answer and explanation

Correct option: A

4.6 \mathrm{~g}

Option A (

4.6 \mathrm{~g}

) is correct because for isotonic solutions, the ratio of mass to molar mass and volume must be equal.

18 Easy

18 of 118

Application +4 | -1

Which of the following shows maximum depression in freezing point?

View answer and explanation

Correct option: A

{K_2}S{O_4}

Option A (K2SO4) is correct because it dissociates into the highest number of ions (3), leading to the maximum depression in freezing point, a colligative property.

19 Easy

19 of 118

Application +4 | -1

Addition of

4.0 \mathrm{~g}

of a non-volatile solute to

54.0 \mathrm{~g}

water results in a lowering of vapour pressure by

1.0 \%.

What is the molar mass of the non-volatile solute?

View answer and explanation

Correct option: C

133.33

Option C (133.33) is correct because it is the molar mass calculated using the relative lowering of vapor pressure formula.

20 Easy

20 of 118

Understanding +4 | -1

Distribution law holds good for the distribution of a dissolved substance between :

View answer and explanation

Correct option: D

Liquid-gas, liquid-liquid and liquid-solid phases

The correct answer is D (Liquid-gas, liquid-liquid and liquid-solid phases) because the distribution law applies to the distribution of a dissolved substance between any heterogeneous system.

21 Easy

21 of 118

Remembering +4 | -1

When a non – volatile solute is dissolved in a solvent, the relative lowering of vapour pressure is equal to

View answer and explanation

Correct option: A

Molefraction of solute

Option A (Molefraction of solute) is correct because the relative lowering of vapor pressure is equal to the mole fraction of the solute according to Raoult's Law.

22 Easy

22 of 118

Application +4 | -1

36 \mathrm{~g}

water and

828 \mathrm{~g}

ethyl alcohol form an ideal solution. The mole fraction of water in it is:

View answer and explanation

Correct option: D

0.1

Option D (0.1) is correct because it is calculated by finding the mole fraction of water in the ideal solution.

23 Easy

23 of 118

Understanding +4 | -1

In countries nearer to polar region, the roads are sprinkled with

CaC{l_2}

. This is

View answer and explanation

Correct option: A

To minimise the wear and tear of the roads

The correct answer is A.

CaCl_2

lowers the freezing point of water, preventing ice formation and minimizing road damage.

24 Easy

24 of 118

Remembering +4 | -1

Colligative properties depend on

View answer and explanation

Correct option: B

the number of solute particles in solution

Option B is correct because colligative properties depend only on the number of solute particles in a solution, not their nature.

25 Easy

25 of 118

Remembering +4 | -1

The phenomenon in which cells are shrinked down if placed in hypertonic solution is called :

View answer and explanation

Correct option: A

Plasmolysis

Option A (Plasmolysis) is correct because plasmolysis is the process where cells shrink due to water loss when placed in a hypertonic solution.

26 Easy

26 of 118

Remembering +4 | -1

The natural semipermeable membrane is :

View answer and explanation

Correct option: C

Plant cell

Option C (Plant cell) is correct because plant cells have semipermeable membranes.

27 Easy

27 of 118

Understanding +4 | -1

A solution of acetone in ethanol

View answer and explanation

Correct option: C

Show a positive deviation from Raoult’s law

Option C (Show a positive deviation from Raoult’s law) is correct because the interactions between acetone and ethanol are weaker than their self-interactions, leading to higher vapor pressure.

28 Easy

28 of 118

Analyzing +4 | -1

Which statement is not correct if two immiscible liquids of mol. wt. A and B respectively are mixed in equal amount to have a mixture?

View answer and explanation

Correct option: C

{P_M} = P_A^ \circ {\left( {{X_A}} \right)_l} + P_B^ \circ {\left( {{X_B}} \right)_l}

Option C (

{P_M} = P_A^ \circ {\left( {{X_A}} \right)_l} + P_B^ \circ {\left( {{X_B}} \right)_l}

) is not correct because Raoult's law does not apply to immiscible liquid mixtures.

29 Easy

29 of 118

Analyzing +4 | -1

The freezing point of equilibrium solution in aqueous medium will be highest for

View answer and explanation

Correct option: B

\mathrm{C}_6 \mathrm{H}_{12} \mathrm{O}_6

Option B (

\mathrm{C}_6 \mathrm{H}_{12} \mathrm{O}_6

) is correct because glucose is a non-electrolyte and does not dissociate in water, resulting in the smallest freezing point depression and thus the highest freezing point.

30 Easy

30 of 118

Understanding +4 | -1

Solubility of deliquescent substances in water is generally :

View answer and explanation

Correct option: A

High

Option A (High) is correct because deliquescent substances absorb a large amount of water from the atmosphere to form a saturated solution, indicating high solubility.

Revision notes and key takeaways

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Key Takeaways

✓ This set contains 118 single-correct-answer MCQs on SOLUTIONS.
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