Iodine was added to a system of water and ${\rm{C}}{{\rm{S}}_2}$. The concentration of ${{\rm{I}}_2}$ in water and ${\rm{C}}{{\rm{S}}_2}$ were found to be ${C_1}/{C_2}$ respectively. The ratio of ${C_1}/{C_2}$ will change if :

More ${\rm{C}}{{\rm{S}}_2}$ is added

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Solutions practice · Mixed difficulty

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1 Medium

1 of 226

Understanding +4 | -1

Consider the solution of ethanol. In it

View answer and explanation

Correct option: D

Both (1) and (2)

Option D (Both (1) and (2)) is correct because in a solution of ethanol, ethanol can be dissolved in water, and the components are in the same phase (liquid).

2 Hard

2 of 226

Understanding +4 | -1

Assertion: Isotonic solutions don't show net phenomenon of osmosis.

Reason: Isotonic solutions have equal osmotic pressure at constant temperature.

View answer and explanation

Correct option: A

If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion

Option A (If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion) is correct because isotonic solutions have the same osmotic pressure, which is why there is no net osmosis.

3 Medium

3 of 226

Application +4 | -1

0.2 molal aqueous solution of a monobasic acid is 60% ionised. If Kb for water is

0.52\,K\,kg\,mo{l^{ - 1}}

then the boiling point of the solution will be

View answer and explanation

Correct option: B

{100.17^0}C

Option B (

{100.17^0}C

) is correct because it is the calculated boiling point elevation considering the ionization of the monobasic acid.

4 Hard

4 of 226

Application +4 | -1

The vapour pressures of pure liquids

A

and

B

are 400 and 600 mmHg, respectively at 298 K. On mixing the two liquids, the sum of their initial volumes is equal to the volume of the final mixture. The mole fraction of liquid

B

is 0.5 in the mixture. The vapour pressure of the final solution, the mole fractions of components

A

and

B

in vapour phase, respectively are

View answer and explanation

Correct option: D

500 mmHg, 0.4, 0.6

Option D (500 mmHg, 0.4, 0.6) is correct because it follows Raoult's law for ideal solutions, and the vapor phase mole fractions are calculated using partial pressures.

5 Medium

5 of 226

Application +4 | -1

What is molecular weight of a substance whose 7.0% by mass solution in water freezes at

--{0.93^0}C

{K_f}

for water is

1.86\mathrm{ }K\mathrm{ }kg\mathrm{ }mo{l^{ - 1}}

View answer and explanation

Correct option: B

150\,.5\,g\,mo{l^{ - 1}}

Option B (

150.5\,.5\,g\,mo{l^{ - 1}}

) is correct because it is calculated using the freezing point depression formula and the given percentage by mass.

6 Easy

6 of 226

Application +4 | -1

A mixture of ethyl alcohol and propyl alcohol has a vapour pressure of 290 mm at 300 K. the vapour pressure of propyl alcohol is 200 mm. If the mole fraction of ethyl alcohol is 0.6, its vapour pressure (in mm) at the same temperature will be

View answer and explanation

Correct option: A

350

Option A (350) is correct because it is calculated using Raoult's Law for a mixture of two volatile liquids.

7 Medium

7 of 226

Application +4 | -1

Molecular weight of glucose is 180. A solution of glucose which contains 18 g/L, is

View answer and explanation

Correct option: A

0.1 molal

Option A (0.1 molal) is correct because it is the molality calculated from the given mass of glucose per liter of solution, approximating the density of the solution as 1 g/mL.

8 Hard

8 of 226

Analyzing +4 | -1

A solute when distributed between two immiscible phases remains associated in phase II and dissociated in phase I. If αis the degree of dissociation and n is the number of molecules associated then :

View answer and explanation

Correct option: D

K = \frac{{{c_\mathrm{I}}\left( {1 - \mathrm{\alpha }} \right)}}{{\sqrt[n]{{{c_{\mathrm{II}}}}}}}

Option D is correct because it represents the distribution law when the solute associates in phase II and dissociates in phase I, considering the degree of dissociation and association number.

9 Hard

9 of 226

Application +4 | -1

The osmotic pressure

(At\;27^\circ C)

of an aqueous solution (200 mL) containing 6 g of a protein is

2 \times {10^{ - 3}}\;\mathrm{atm}.

R = 0.080\mathrm{ }L - atm\mathrm{ }\;mo{l^{ - 1}}{K^{ - 1}},

the molecular weight of protein is

View answer and explanation

Correct option: B

3.6 \times {10^5}

Option B (

3.6 \times {10^5}

) is correct because it is the calculated molecular weight of the protein using the osmotic pressure formula.

10 Easy

10 of 226

Analyzing +4 | -1

At a constant temperature, which of the following aqueous solutions will have the maximum vapour pressure?
(Mol. wt NaCl =58.5,

{\mathrm{H}_2}\mathrm{S}{\mathrm{O}_4} = 98.0\;\mathrm{g}\mathrm{.mo}{\mathrm{l}^{ - 1}})

View answer and explanation

Correct option: A

1 molal NaCl (aq)

Option A (1 molal NaCl (aq)) is correct because, at a constant temperature, the solution with the lowest effective concentration of solute particles will have the highest vapor pressure. Molality is approximately equal to molarity for dilute aqueous solutions, and NaCl dissociates into two ions.

11 Medium

11 of 226

Understanding +4 | -1

Molal elevation constant of a liquid is :

View answer and explanation

Correct option: C

Elevation in b.p. which would be produced by dissolving 1 mole of solute in 1000 g of solvent

Option C (Elevation in b.p. which would be produced by dissolving 1 mole of solute in 1000 g of solvent) is correct because molal elevation constant is defined for 1 mole of solute in 1000g (1 kg) of solvent.

12 Medium

12 of 226

Understanding +4 | -1

Read the following statements and choose the correct option.

(i) Polar solutes dissolve in a polar solvent.

(ii) Polar solutes dissolve in a non-polar solvent.

(iii) Non-polar solutes dissolve in a non-polar solvent.

(iv) Non-polar solutes dissolve in a polar solvent.

View answer and explanation

Correct option: C

(i) and (iii) are correct.

Option C ((i) and (iii) are correct) is correct because polar solutes dissolve in polar solvents, and non-polar solutes dissolve in non-polar solvents.

13 Hard

13 of 226

Understanding +4 | -1

{K}_{{H}}

value for some gases at the same temperature '

{T}

' are given:

\begin{array}{cccccccccccccccccccc} {{\text{Gas}}}&{{K_H}/k\,\,{\text{bar}}} \\ {Ar}&{40.3} \\ {C{O_2}}&{1.67} \\ {HCHO}&{1.83 \times {{10}^{ - 5}}} \\ {C{H_4}}&{0.413} \end{array}

where

{K}_{{H}}

is Henry's Law constant in water. The order of their solubility in water is:

View answer and explanation

Correct option: B

{Ar} < {CO}_2 < {CH}_4 < {HCHO}

Option B (

{Ar} < {CO}_2 < {CH}_4 < {HCHO}

) is correct because the solubility of a gas is inversely proportional to its Henry's Law constant (

K_H

14 Easy

14 of 226

Analyzing +4 | -1

Which of the following has minimum freezing point?

View answer and explanation

Correct option: D

0.1 \mathrm{~M} \mathrm{~Al}_2\left(\mathrm{SO}_4\right)_3

Option D is correct because the freezing point depression is proportional to the van't Hoff factor (i), which is the number of ions produced per formula unit. Al2(SO4)3 has the highest i value (i=5), leading to the greatest freezing point depression and thus the minimum freezing point.

15 Hard

15 of 226

Understanding +4 | -1

Assertion: In positive deviation of non-idea If solution attraction between solute solvent is less than the attraction between solute-solute and solvent-solvent.

Reason: In negative deviation of non-ideal solution attraction between solute-solvent is more than the attraction between solute-solute and solvent-solvent.

View answer and explanation

Correct option: B

If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion

Option B (If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion) is correct because both statements about positive and negative deviations are true, but the reason doesn't directly explain the assertion.

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16 Easy

16 of 226

Application +4 | -1

The freezing point of equimolal aqueous solution will be highest for

View answer and explanation

Correct option: C

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

Option C (

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

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

17 Easy

17 of 226

Understanding +4 | -1

Which is not a colligative property in the following?

View answer and explanation

Correct option: A

pH ofa buffer solution

Option A (pH of a buffer solution) is correct because pH of a buffer solution is determined by the Henderson-Hasselbalch equation and depends on the specific acid and base used, not just the number of particles.

18 Easy

18 of 226

Application +4 | -1

The vapour pressure of two pure liquid

\mathrm{(A)}

and

\mathrm{(B)}

are 100 torr and 80 torr respectively. The total pressure of solution obtained by mixing 2 mole of

\mathrm{(A)}

and 3 mole of

\mathrm{(B)}

would be :

View answer and explanation

Correct option: C

88 torr

Option C (88 torr) is correct because it is calculated using Raoult's Law, considering the mole fractions and vapor pressures of the pure liquids.

19 Easy

19 of 226

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 (

{K_2}S{O_4}

) is correct because it dissociates into the largest number of ions (3) compared to the other options, leading to the greatest depression in freezing point.

20 Medium

20 of 226

Understanding +4 | -1

A super saturated solution is a metastable state of solution in which solute concentration.

View answer and explanation

Correct option: B

Exceeds than its solubility

Option B (Exceeds than its solubility) is correct because a supersaturated solution contains more solute than the solvent can normally dissolve at that temperature.

21 Hard

21 of 226

Analyzing +4 | -1

Two components A and B form an ideal solution. The mole fractions of

A

and

B

in ideal solution are

X_A

and

X_B

, while that of in vapour phase, these components have their mole fractions as

\mathrm{Y}_{\mathrm{A}}

and

\mathrm{Y}_{\mathrm{B}}

. Then, the slope and intercept of plot of

\frac{1}{\mathrm{Y}_{\mathrm{A}}}

vs.

\frac{1}{\mathrm{X}_{\mathrm{A}}}

will be:

View answer and explanation

Correct option: B

\frac{\mathrm{P}_{\mathrm{B}}^{\mathrm{o}}}{\mathrm{P}_{\mathrm{A}}^{\mathrm{o}}}, \frac{\mathrm{P}_{\mathrm{A}}^{\mathrm{o}}-\mathrm{P}_{\mathrm{B}}^{\mathrm{o}}}{\mathrm{P}_{\mathrm{A}}^{\mathrm{o}}}

Option B (

\frac{\mathrm{P}_{\mathrm{B}}^{\mathrm{o}}}{\mathrm{P}_{\mathrm{A}}^{\mathrm{o}}}, \frac{\mathrm{P}_{\mathrm{A}}^{\mathrm{o}}-\mathrm{P}_{\mathrm{B}}^{\mathrm{o}}}{\mathrm{P}_{\mathrm{A}}^{\mathrm{o}}}

) is correct because it is derived from Raoult's law and the definition of mole fractions in the vapor phase.

22 Medium

22 of 226

Remembering +4 | -1

The mixture of two liquids boils without changing its composition is called

View answer and explanation

Correct option: C

Azeotropic liquid mixture

Option C (Azeotropic liquid mixture) is correct because azeotropes are mixtures that boil at a constant temperature without changing composition.

23 Easy

23 of 226

Analyzing +4 | -1

Iodine was added to a system of water and

\mathrm{C}{\mathrm{S}_2}

. The concentration of

{\mathrm{I}_2}

in water and

\mathrm{C}{\mathrm{S}_2}

were found to be

{C_1}/{C_2}

respectively. The ratio of

{C_1}/{C_2}

will change if :

View answer and explanation

Correct option: B

\mathrm{C}{\mathrm{S}_2}

is added

Option B (More

\mathrm{C}{\mathrm{S}_2}

is added) is correct because it changes the volume of the organic phase, thus affecting the distribution ratio.

24 Easy

24 of 226

Understanding +4 | -1

Solubility of a gas in liquid increases on:

View answer and explanation

Correct option: B

Increasing the pressure

Option B (Increasing the pressure) is correct because, according to Henry's Law, increasing the pressure increases the solubility of a gas in a liquid.

25 Easy

25 of 226

Application +4 | -1

\mathrm{100}\;\mathrm{mL}\;\mathrm{of}\,\mathrm{0}\mathrm{.3}\;\mathrm{HCl}

is mixed with

200\;mL\;of\;0.6\;\mathrm{N}\;{\mathrm{H}_2}\mathrm{S}{\mathrm{O}_4}

. The final normality of the resulting solution will be

View answer and explanation

Correct option: C

0.5\;\mathrm{ }N

Option C (

0.5\;\mathrm{ }N

) is correct because the final normality is calculated by summing the milliequivalents of each acid and dividing by the total volume.

26 Medium

26 of 226

Application +4 | -1

If for a sucrose solution elevation in boiling point is

0.1^\circ C

then what will be boiling point of

\mathrm{NaCl}

solution for the same molal concentration?

View answer and explanation

Correct option: B

0.2

Option B is correct because NaCl dissociates into two ions, doubling the effect on boiling point elevation compared to sucrose, which does not dissociate.

27 Medium

27 of 226

Remembering +4 | -1

Azeotropic mixture of

\mathrm{HCl}

and

\mathrm{H}_2 \mathrm{O}

has

View answer and explanation

Correct option: D

20.2 \% \mathrm{~HCl}

Option D (20.2 %

\mathrm{HCl}

) is correct because that is the approximate composition of the azeotropic mixture of HCl and water.

28 Easy

28 of 226

Understanding +4 | -1

Positive deviation is observed in case of

View answer and explanation

Correct option: D

{C_6}{H_6} + C{H_3}COC{H_3}

Option D (

{C_6}{H_6} + C{H_3}COC{H_3}

) is correct because the interaction between benzene and acetone is weaker than their self-interactions, leading to a positive deviation.

29 Medium

29 of 226

Understanding +4 | -1

Which of the following colligative property is used to determine molar masses of proteins ?

View answer and explanation

Correct option: D

Osmotic pressure

Osmotic pressure is the colligative property most commonly used to determine the molar masses of proteins due to the large molar masses of proteins resulting in measurable osmotic pressure, making option D the correct answer.

30 Medium

30 of 226

Remembering +4 | -1

The pressure under which liquid and its vapour can coexist in equilibrium is known as:

View answer and explanation

Correct option: B

Saturated vapour pressure

Option B (Saturated vapour pressure) is correct because it defines the pressure at which a liquid and its vapor coexist in equilibrium.

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