Test: Colligative Properties and Determination of Molar Mass (NCERT)

Question 1

The relative lowering in vapour pressure is proportional to the ratio of number of

Accepted Answer

Solute molecules to the total number of molecules in solution

Answer

Solute molecules to solvent molecules

Answer

Solvent molecules of solute molecules

Answer

Solvent molecules to the total number of molecules in solution

Question 2

Vapour pressure of a pure liquid X is 2 atm at 300 K. It is lowered to 1 atm on dissolving 1 g of Y in 20 g of liquid X. If molar mass of X is 200, what is the molar mass of Y?

Accepted Answer

20

Answer

50

Answer

100

Answer

200

Question 3

An aqueous solution of 2% non - volatile solute exerts a pressure of 1.004 bar at the normal boiling point of the solvent. What is the molar mass of the solute?

Accepted Answer

41.35 g mol^-1

Answer

23.4 g mol^-1

Answer

10 g mol^-1

Answer

20.8 g mol^-1

Question 4

In the graph plotted between vapour pressure (V.P) and temperature (T).

Accepted Answer

PQ is the curve for solvent, XY is the curve for solution and ΔT is elevation in boiling point

Answer

PQ is the curve for solvent, XY is the curve of solution and ΔT is depression on freezing point

Answer

PQ is the curve for solution, XY is the curve for solvent and ΔT is elevation in boiling point

Answer

PQ is the curve for solvent, XY is the curve for solution and ΔT is molal elevation in boiling point

Question 5

A solution containing 12.5g of non-electrolyte substance in 185g of water shows boiling point elevation of 0.80K. Calculate the molar mass of the substance. (K_b = 0.52K kg mol⁻¹)

Accepted Answer

43.92 g mol⁻¹

Answer

53.06 g mol⁻¹

Answer

25.3 g mol⁻¹

Answer

16.08 g mol⁻¹

Question 6

If 1g of solute (molar mass = 50g mol⁻¹) is dissolved in 50g of solvent and the elevation in boiling point is 1K. The molar boiling constant of the solvent is?

Accepted Answer

2.5

Answer

2

Answer

3

Answer

5

Question 7

2 g of sugar is added to one litre of water to give sugar solution. What is the effect of addition of sugar on the boiling point and freezing point of water?

Accepted Answer

Boiling point increases and freezing point decreases

Answer

Both boiling point and freezing point increase

Answer

Both boiling point and freezing point decrease

Answer

Boiling point decreases and freezing point increases

Question 8

Sprinkling of salt helps in clearing the snow-covered roads in hills. The phenomenon involved in the process is

Accepted Answer

Depression in freezing point of snow

Answer

Lowering in vapour pressure of snow

Answer

Increase in freezing point of snow

Answer

Melting of ice due to increase in temperature by putting salt

Question 9

Equimolar solutions in the same solvent have

Accepted Answer

Same elevation in boiling point and same depression in freezing point

Answer

Different elevation in boiling point and different depression in freezing point

Answer

Same elevation in boiling point but different depression in freezing point

Answer

Same depression in freezing point but different elevation in boiling point

Question 10

A 5% solution (w/W) of cane sugar (molar mass = 342 g mol^-1) has freezing point of 271 K. What will be the freezing point of a 5% glucose (molar mass = 18 g mol^-1) in water if freezing point of pure water is 273.15 K?

Accepted Answer

269.07 K

Answer

273.07 K

Answer

273.15 K

Answer

260.09 K

Question 11

What weight of glycerol should be added to 600g of water in order to lower its freezing point by 10^∘C? (K_f= 1.86^∘Cm⁻¹)

Accepted Answer

297 g

Answer

496 g

Answer

310 g

Answer

426 g

Question 12

The osmotic pressure of a solution can be increased by

Accepted Answer

Increasing the number of solute molecules

Answer

Increasing the volume

Answer

Decreasing the temperature

Answer

Removing semipermeable membrane

Question 13

Answer the following questions on the basis of given paragraph.
Osmotic pressure is widely used to determine molar masses of proteins and polymers. Two solutions having same osmotic pressure are called isotonic solutions. Water can flow in or out from substance depending on if it is kept in hypotonic or hypertonic solutions. The direction of the osmosis can be reversed if a pressure larger than osmotic pressure is applied on solution side.

Q. People taking lot of salt experience puffiness or swelling of the body due to

Accepted Answer

Water retention in tissue cells and intercellular spaces because of osmosis

Answer

Water loss from the cells through skin tissues

Answer

Capillary action of water through skin pores

Answer

Excessive thirst and drinking more water

Question 14

Answer the following questions on the basis of given paragraph.
Osmotic pressure is widely used to determine molar masses of proteins and polymers. Two solutions having same osmotic pressure are called isotonic solutions. Water can flow in or out from substance depending on if it is kept in hypotonic or hypertonic solutions. The direction of the osmosis can be reversed if a pressure larger than osmotic pressure is applied on solution side.

Q. The preservation of meat by salting and of fruits by adding sugar protects them from bacterial action because

Accepted Answer

Due to osmosis bacteria lose water on salted meat or candid fruit and die

Answer

Bacteria die of eating sugar or salt

Answer

Due to osmosis bacteria gain water on salted meat or candid fruit and die

Answer

Bacteria get stuck to the salt and sugar layers and die

Question 15

Answer the following questions on the basis of given paragraph.
Osmotic pressure is widely used to determine molar masses of proteins and polymers. Two solutions having same osmotic pressure are called isotonic solutions. Water can flow in or out from substance depending on if it is kept in hypotonic or hypertonic solutions. The direction of the osmosis can be reversed if a pressure larger than osmotic pressure is applied on solution side.
Q. Sea water is desalinated to get fresh water by which of the following methods?

Accepted Answer

When pressure more than osmotic pressure is applied pure water is squeezed out of sea water by reverse osmosis

Answer

When excess pressure is applied on sea water pure water moves in by osmosis

Answer

Water moves out from sea water due to osmosis

Answer

Salt is precipitated from sea water when kept undisturbed for sometime

Question 16

Which of the following statements is not correct?

Accepted Answer

Two solutions of sucrose of same molality prepared in different solvents will have same elevation in boiling point

Answer

Osmotic pressure(π) of a solution is given by the relation π = MRT, where M is the molarity of the solution

Answer

The correct order of osmotic pressure for 0.2M aqueous solution of each solute is CaCl₂ > NaCl > CH₃COOH > glucose

Answer

Relative lowering in vapour pressure of a solution containing non-volatile solute is directly proportional to mole fraction of solution is Raoult's law

Question 17

10% solution of urea is isotonic with 6% solution of a non-volatile solute X.What is the molecular mass of solute X?

Accepted Answer

36 g mol⁻¹

Answer

6 g mol⁻¹

Answer

60 g mol⁻¹

Answer

32 g mol⁻¹

Question 18

A solution containing 10.2g glycerine per litre is isotonic with a 2% solution of glucose. What is the molecular mass of glycerine?

Accepted Answer

91.8 g

Answer

1198 g

Answer

83.9 g

Answer

890.3 g

Question 19

What will be the osmotic pressure in pascals exerted by a solution prepared by dissolving 1.0 g of polymer of molar mass 150,000 in 500 mL of water at 37^∘C?

Accepted Answer

34.36 Pa

Answer

30.96 Pa

Answer

68.72 Pa

Answer

48.25 Pa

Question 20

Osmotic pressure of a solution containing 2g dissolved protein per 300cm² of solution is 20mm of Hg at 27^oC. The molecular mass of protein is

Accepted Answer

6239.6 g mol⁻¹

Answer

12315.5 g mol⁻¹

Answer

3692.1 g mol⁻¹

Answer

7368.4 g mol⁻¹

Question 21

A solution is made by dissolving 20g of a substance in 500mL of water. Its osmotic pressure was found to be 600mm of Hg at 15^∘C. Find the molecular weight of the substance.

Accepted Answer

1198

Answer

500

Answer

1200

Answer

1000

Question 22

Which of the following statements is not correct?

Accepted Answer

5% aqueous solutions of NaCl and KCl are said to be isomolar

Answer

1 M sucrose solution and 1 M glucose solution are isotonic

Answer

Molecular mass of acetic acid and benzoic acid is higher than normal mass in cryoscopic methods

Answer

For the same solution, ΔT_b/ΔT_f = K_b/K_f

Question 23

Grapes placed in three beakers X, Y and Z containing different type of solutions are shown in figures.

If beaker X contains water, Y and Z contains:

Accepted Answer

Y - hypotonic solution, Z - hypertonic solution

Answer

Y - hypertonic solution, Z - hypotonic solution

Answer

Y and Z - isotonic solutions

Answer

Y and Z - hypotonic solutions

Question 24

A plant cell shrinks when it is kept in a

Accepted Answer

Hypertonic solution

Answer

Hypotonic solution

Answer

Isotonic solution

Answer

Pure water

Question 25

Which of the following statements is correct?

Accepted Answer

The depression in freezing point is directly proportional to molality of the solution

Answer

A saturated solution will remain saturated at all temperatures

Answer

A plant cell swells when placed in hypertonic solution

Answer

Lowering in vapour pressure is a colligative property

Colligative Properties and Determination of Molar Mass (NCERT) - Free MCQ

MCQ Practice Test & Solutions: Test: Colligative Properties and Determination of Molar Mass (NCERT) (25 Questions)

The relative lowering in vapour pressure is proportional to the ratio of number of

Explanation:

Why Other Options Are Incorrect:

Final Answer:

Vapour pressure of a pure liquid X is 2 atm at 300 K. It is lowered to 1 atm on dissolving 1 g of Y in 20 g of liquid X. If molar mass of X is 200, what is the molar mass of Y?

An aqueous solution of 2% non - volatile solute exerts a pressure of 1.004 bar at the normal boiling point of the solvent. What is the molar mass of the solute?

In the graph plotted between vapour pressure (V.P) and temperature (T).

A solution containing 12.5g of non-electrolyte substance in 185g of water shows boiling point elevation of 0.80K. Calculate the molar mass of the substance. (K_b = 0.52K kg mol⁻¹)

If 1g of solute (molar mass = 50g mol⁻¹) is dissolved in 50g of solvent and the elevation in boiling point is 1K. The molar boiling constant of the solvent is?

2 g of sugar is added to one litre of water to give sugar solution. What is the effect of addition of sugar on the boiling point and freezing point of water?

Sprinkling of salt helps in clearing the snow-covered roads in hills. The phenomenon involved in the process is

Equimolar solutions in the same solvent have

A 5% solution (w/W) of cane sugar (molar mass = 342 g mol^-1) has freezing point of 271 K. What will be the freezing point of a 5% glucose (molar mass = 18 g mol^-1) in water if freezing point of pure water is 273.15 K?

What weight of glycerol should be added to 600g of water in order to lower its freezing point by 10^∘C? (K_f= 1.86^∘Cm⁻¹)

The osmotic pressure of a solution can be increased by

Which of the following statements is not correct?

10% solution of urea is isotonic with 6% solution of a non-volatile solute X.What is the molecular mass of solute X?

A solution containing 10.2g glycerine per litre is isotonic with a 2% solution of glucose. What is the molecular mass of glycerine?

What will be the osmotic pressure in pascals exerted by a solution prepared by dissolving 1.0 g of polymer of molar mass 150,000 in 500 mL of water at 37^∘C?

Osmotic pressure of a solution containing 2g dissolved protein per 300cm² of solution is 20mm of Hg at 27^oC. The molecular mass of protein is

A solution is made by dissolving 20g of a substance in 500mL of water. Its osmotic pressure was found to be 600mm of Hg at 15^∘C. Find the molecular weight of the substance.

Which of the following statements is not correct?

Grapes placed in three beakers X, Y and Z containing different type of solutions are shown in figures.

If beaker X contains water, Y and Z contains:

A plant cell shrinks when it is kept in a

Which of the following statements is correct?

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Colligative Properties and Determination of Molar Mass (NCERT) - Free MCQ

MCQ Practice Test & Solutions: Test: Colligative Properties and Determination of Molar Mass (NCERT) (25 Questions)

The relative lowering in vapour pressure is proportional to the ratio of number of

Explanation:

Why Other Options Are Incorrect:

Final Answer:

Vapour pressure of a pure liquid X is 2 atm at 300 K. It is lowered to 1 atm on dissolving 1 g of Y in 20 g of liquid X. If molar mass of X is 200, what is the molar mass of Y?

An aqueous solution of 2% non - volatile solute exerts a pressure of 1.004 bar at the normal boiling point of the solvent. What is the molar mass of the solute?

In the graph plotted between vapour pressure (V.P) and temperature (T).

A solution containing 12.5g of non-electrolyte substance in 185g of water shows boiling point elevation of 0.80K. Calculate the molar mass of the substance. (Kb ​= 0.52K kg mol−1)

If 1g of solute (molar mass = 50g mol−1) is dissolved in 50g of solvent and the elevation in boiling point is 1K. The molar boiling constant of the solvent is?

2 g of sugar is added to one litre of water to give sugar solution. What is the effect of addition of sugar on the boiling point and freezing point of water?

Sprinkling of salt helps in clearing the snow-covered roads in hills. The phenomenon involved in the process is

Equimolar solutions in the same solvent have

A 5% solution (w/W) of cane sugar (molar mass = 342 g mol-1) has freezing point of 271 K. What will be the freezing point of a 5% glucose (molar mass = 18 g mol-1) in water if freezing point of pure water is 273.15 K?

What weight of glycerol should be added to 600g of water in order to lower its freezing point by 10∘C? (Kf = 1.86∘Cm−1)

The osmotic pressure of a solution can be increased by

Which of the following statements is not correct?

10% solution of urea is isotonic with 6% solution of a non-volatile solute X.What is the molecular mass of solute X?

A solution containing 10.2g glycerine per litre is isotonic with a 2% solution of glucose. What is the molecular mass of glycerine?

What will be the osmotic pressure in pascals exerted by a solution prepared by dissolving 1.0 g of polymer of molar mass 150,000 in 500 mL of water at 37∘C?

Osmotic pressure of a solution containing 2g dissolved protein per 300cm2 of solution is 20mm of Hg at 27oC. The molecular mass of protein is

A solution is made by dissolving 20g of a substance in 500mL of water. Its osmotic pressure was found to be 600mm of Hg at 15∘C. Find the molecular weight of the substance.

Which of the following statements is not correct?

Grapes placed in three beakers X, Y and Z containing different type of solutions are shown in figures. If beaker X contains water, Y and Z contains:

A plant cell shrinks when it is kept in a

Which of the following statements is correct?

NCERT Based Tests for NEET

NCERT Based Tests for NEET

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About this NEET Practice Test

Explore more NEET Study Resources

A solution containing 12.5g of non-electrolyte substance in 185g of water shows boiling point elevation of 0.80K. Calculate the molar mass of the substance. (K_b = 0.52K kg mol⁻¹)

If 1g of solute (molar mass = 50g mol⁻¹) is dissolved in 50g of solvent and the elevation in boiling point is 1K. The molar boiling constant of the solvent is?

A 5% solution (w/W) of cane sugar (molar mass = 342 g mol^-1) has freezing point of 271 K. What will be the freezing point of a 5% glucose (molar mass = 18 g mol^-1) in water if freezing point of pure water is 273.15 K?

What weight of glycerol should be added to 600g of water in order to lower its freezing point by 10^∘C? (K_f= 1.86^∘Cm⁻¹)

What will be the osmotic pressure in pascals exerted by a solution prepared by dissolving 1.0 g of polymer of molar mass 150,000 in 500 mL of water at 37^∘C?

Osmotic pressure of a solution containing 2g dissolved protein per 300cm² of solution is 20mm of Hg at 27^oC. The molecular mass of protein is

A solution is made by dissolving 20g of a substance in 500mL of water. Its osmotic pressure was found to be 600mm of Hg at 15^∘C. Find the molecular weight of the substance.

Grapes placed in three beakers X, Y and Z containing different type of solutions are shown in figures.

If beaker X contains water, Y and Z contains: