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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Showing 1-30 of 83 questions

1 Easy

1 of 83

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.

2 Easy

2 of 83

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.

3 Easy

3 of 83

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.

4 Easy

4 of 83

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.

5 Easy

5 of 83

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.

6 Easy

6 of 83

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.

7 Easy

7 of 83

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.

8 Easy

8 of 83

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.

9 Easy

9 of 83

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.

10 Easy

10 of 83

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.

11 Easy

11 of 83

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.

12 Easy

12 of 83

Remembering +4 | -1

Azeotropic mixture of

HCl

and water has

View answer and explanation

Correct option: D

20.2\% \mathrm{ }\;HCl

The correct answer is D (20.2% HCl) because the azeotropic mixture of HCl and water has a specific composition at which it boils at a constant temperature.

13 Easy

13 of 83

Remembering +4 | -1

Iodine and sulphur dissolve in

View answer and explanation

Correct option: C

carbon disulphide

The correct answer is C (carbon disulphide) because iodine and sulfur are nonpolar and dissolve best in nonpolar solvents like carbon disulfide.

14 Easy

14 of 83

Application +4 | -1

2.5\mathrm{ }\;L\;\mathrm{ }of\;\mathrm{ }NaCl

solution contain 5 moles of the solute.What is the molarity ?

View answer and explanation

Correct option: B

Option B (2M) is correct because molarity is calculated by dividing the number of moles of solute by the volume of the solution in liters.

15 Easy

15 of 83

Understanding +4 | -1

Van’t Hoff factor more than unity indicates that the solute in solution has

View answer and explanation

Correct option: A

Dissociated

Option A (Dissociated) is correct because a van't Hoff factor greater than unity indicates that the solute has dissociated into more particles in solution.

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16 Easy

16 of 83

Understanding +4 | -1

Choose the correct statement.
When concentration of a salt solution is increased

View answer and explanation

Correct option: A

Boiling point increases while vapour pressure decreases.

Option A (Boiling point increases while vapour pressure decreases) is correct because increasing the salt concentration elevates the boiling point and lowers the vapor pressure due to colligative properties.

17 Easy

17 of 83

Analyzing +4 | -1

Assertion (A): Isotonic solutions must have same elevation in boiling point.

Reason (R): Osmotic pressure,

\pi=i C R T

View answer and explanation

Correct option: D

A is false, R is true

Option D is correct because isotonic solutions have the same osmotic pressure, but not necessarily the same elevation in boiling point, as elevation in boiling point depends on molality and the van't Hoff factor, while the formula for osmotic pressure is correct.

18 Easy

18 of 83

Understanding +4 | -1

When a crystal of the solute is introduced into a super saturated solution of the solute :

View answer and explanation

Correct option: B

The excess solute crystallizes out

Option B (The excess solute crystallizes out) is correct because a supersaturated solution contains more solute than it can normally hold, and adding a crystal initiates crystallization.

19 Easy

19 of 83

Understanding +4 | -1

Which of the following represents a metastable system?

View answer and explanation

Correct option: D

A supersaturated solution

Option D (A supersaturated solution) is correct because a supersaturated solution contains more solute than it can theoretically hold at a given temperature and is therefore in a metastable state.

20 Easy

20 of 83

Remembering +4 | -1

Which of the following is the expression of Raoult’s law?
(

{p = }

vapour pressure of pure solvent,

{{p_s}}

=vapour pressure of the solution)

View answer and explanation

Correct option: A

\frac{{p - {p_s}}}{p} = \frac{n}{{n + N}}

Option A is the correct expression of Raoult's law, relating the relative lowering of vapor pressure to the mole fraction of the solute.

21 Easy

21 of 83

Remembering +4 | -1

The solubility of a gas in liquid at a temperature is directly proportional to its :

View answer and explanation

Correct option: D

Pressure

Option D (Pressure) is correct because, according to Henry's Law, the solubility of a gas in a liquid is directly proportional to its pressure.

22 Easy

22 of 83

Understanding +4 | -1

In the case of osmosis, solvent molecules move from :

View answer and explanation

Correct option: A

Higher vapour pressure to lower vapour pressure

Option A (Higher vapour pressure to lower vapour pressure) is correct because solvent molecules move from an area of higher solvent activity (higher vapor pressure) to an area of lower solvent activity (lower vapor pressure) during osmosis.

23 Easy

23 of 83

Understanding +4 | -1

If molecular interaction of two different liquid molecules are stronger than the molecular interactions of the same liquid molecules the mixture is expected to show :

View answer and explanation

Correct option: B

Negative deviations

Option B (Negative deviations) is correct because stronger interactions between different liquid molecules lead to a decrease in vapor pressure, resulting in negative deviations from Raoult's law.

24 Easy

24 of 83

Analyzing +4 | -1

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.

Assertion A: 3.1500 g of hydrated oxalic acid dissolved in water to make 250.0 mL solution will result in 0.1 M oxalic acid solution.

Reason R: Molar mass of hydrated oxalic acid is

126\,{\text{g}}\,{\text{mo}}{{\text{l}}^{ - 1}}

In the light of the above statements, choose the correct answer from the options given below:

View answer and explanation

Correct option: C

Both A and R are true and R is the correct explanation of A

Option C is correct because the molar mass of hydrated oxalic acid is indeed 126 g/mol, and this value is used to calculate the molarity of the solution, making both the assertion and the reason true and related.

25 Easy

25 of 83

Understanding +4 | -1

Boiling point of water is defined as the temperature at which :

View answer and explanation

Correct option: A

Vapour pressure of water is equal to one atmospheric pressure

The boiling point of water is defined as the temperature at which its vapor pressure equals the surrounding atmospheric pressure, making option A the correct answer.

26 Easy

26 of 83

Understanding +4 | -1

Which of the following concentration term is/are independent of temperature?

View answer and explanation

Correct option: C

Mole fraction and molality

Mole fraction and molality are independent of temperature because they are defined in terms of moles and mass, which do not change with temperature, making option C the correct answer. Molarity and normality involve volume, which is temperature-dependent.

27 Easy

27 of 83

Remembering +4 | -1

Most of the processes in our body occur in

View answer and explanation

Correct option: B

liquid solution

Option B (liquid solution) is correct because the biological fluids in our body, such as blood and lymph, are primarily liquid solutions.

28 Easy

28 of 83

Analyzing +4 | -1

An aqueous solution is 1.0 molal in KI. Which change will cause the vapour pressure of solution to increase :

View answer and explanation

Correct option: D

Addition of water

Option D (Addition of water) is correct because adding water dilutes the solution, decreasing the concentration of KI and increasing the vapor pressure.

29 Easy

29 of 83

Application +4 | -1

The exact volumes of

1M\,NaOH

solution required to neutralise 50 mL of

1M\,{H_3}P{O_3}

solution and 100 ml of

2M\,{H_3}P{O_2}

solution, respectively, are

View answer and explanation

Correct option: C

100 mL and 200 mL

Option C (100 mL and 200 mL) is correct because it correctly calculates the volumes of 1M NaOH required to neutralize the given amounts of H3PO3 and H3PO2 solutions, considering their respective basicities.

30 Easy

30 of 83

Remembering +4 | -1

The statement “the relative lowering of the vapour pressure is equal to th ratio ot moles of the solute to the total number of the moles in the solution” refers to

View answer and explanation

Correct option: C

Raoult’s law

Option C (Raoult’s law) is correct because Raoult's law states that the relative lowering of vapor pressure is equal to the mole fraction of the solute.

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Key Takeaways

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