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Test: Colligative Properties - 1 - Chemistry MCQ


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20 Questions MCQ Test Physical Chemistry - Test: Colligative Properties - 1

Test: Colligative Properties - 1 for Chemistry 2024 is part of Physical Chemistry preparation. The Test: Colligative Properties - 1 questions and answers have been prepared according to the Chemistry exam syllabus.The Test: Colligative Properties - 1 MCQs are made for Chemistry 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Colligative Properties - 1 below.
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Test: Colligative Properties - 1 - Question 1

The vapour pressure of a given liquid will decreases if:

Test: Colligative Properties - 1 - Question 2

The normal boiling point of water is 373 K. Vapour pressure of water at temperature T is 23 mm Hg. If the enthalpy of vaporization is 40.67 kJ/mol, then temperature T would be:

Detailed Solution for Test: Colligative Properties - 1 - Question 2

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Test: Colligative Properties - 1 - Question 3

A sample of liquid H2O of mass 18.0 g is injected into an evacuated 7.6 L flask maintained at 27.0°C. If vapour pressure of H2O at 27°C is 24.63 mm Hg. What weight percentage of the water will be vaporized when the system comes to equilibrium? Assume water vapours behaves as an ideal gas. The volume occupied by the liquid water is negligible compared to the volume of the container:

Test: Colligative Properties - 1 - Question 4

Raoult’s law is obeyed by each constituent of a binary liquid solution when:

Test: Colligative Properties - 1 - Question 5

For a binary ideal liquid solution, the total pressure of the solution is given as:

Test: Colligative Properties - 1 - Question 6

For an ideal binary liquid solution with , which relation between XA (mole fraction of A in liquid phase) and YA (mole fraction of A in vapour phase) is correct?

Test: Colligative Properties - 1 - Question 7

An ideal solution is formed by mixing two volatile liquids A and B, XA and XB are the mole fractions of A and B respectively in the solution and YA and YB are the mole fractions of A and B respectively in the vapour phase. A plot of along y–axis against  along x–axis gives a straight line. What is the slope of the straight line?

Test: Colligative Properties - 1 - Question 8

For a dilute solut ion, Raoult’s law states that:

Test: Colligative Properties - 1 - Question 9

The solubility of a specific non–volatile salt is 4 g in 100 g of water at 25°C. If 2.0 g, 4.0 g and 6.0 g of the salt added of 100 g of water at 25°C, in system X, Y, and Z. The vapour pressure would be in the order:

Test: Colligative Properties - 1 - Question 10

The boiling point of C6H6, CH3OH, C6H5NH2 and C6H5NO2 are 80°C, 65ºC, 184°C and 212°C respectively. Which will show highest vapour pressure at room temperature:

Detailed Solution for Test: Colligative Properties - 1 - Question 10

Boiling point is the temperature at which the vapour pressure of the liquid becomes equal to that of the atmospheric pressure. At boiling point, a substance is converted from the liquid phase to the vapoour phase. 

Out of the given liquids, methanol has the lowest boiling point. Therefore at room temperature, methanol will show the highest vapour pressure. 

Test: Colligative Properties - 1 - Question 11

6.0 g of urea was dissolved in 9.9 moles of water. If the vapour pressure of pure water is P°, the vapour pressure of solution is:

Detailed Solution for Test: Colligative Properties - 1 - Question 11

Test: Colligative Properties - 1 - Question 12

An ideal solution was found to have a vapour pressure of 80 torr when the mole fraction of a non– volatile solute was 0.2. What would be the vapour pressure of the pure solvent at the same temperature?

Detailed Solution for Test: Colligative Properties - 1 - Question 12

Test: Colligative Properties - 1 - Question 13

The vapour pressure of an aqueous solution of sucrose at 373 K is found to be 750 mm Hg. The molality of the solution at the same temperature will be:

Test: Colligative Properties - 1 - Question 14

Estimate the lowering of vapour pressure due to the solute (glucose) in a 1.0 M aqueous solution at 100°C:

Test: Colligative Properties - 1 - Question 15

Calculate the mass of a non-volatile solute (molar mass 40 g mol-1) which should be dissolved in 114 g octane to reduce its vapour pressure to 80%.

Detailed Solution for Test: Colligative Properties - 1 - Question 15

Let the vapour pressure of pure octane be p10.

Then, the vapour pressure of the octane after dissolving the non-volatile solute is 80/100 p10 = 0.8 p10.

Molar mass of solute, M2 = 40 g mol - 1

Mass of octane, w1 = 114 g

Molar mass of octane, (C8H18), M1 = 8 × 12 + 18 × 1 = 114 g mol - 1

Applying the relation,

(p10 - p1p10    =  (wM/ (M2  w1 )

⇒ (p10 - 0.8 p10p10    =  (w114 / (40  x 114 )

⇒ 0.2 p10 / p10   =  w/ 40

⇒ 0.2 = w/ 40

 w2 = 8 g

Hence, the required mass of the solute is 8 g.

Test: Colligative Properties - 1 - Question 16

Equal weight of a solute are dissolved in equal weight of two solvents A and B formed very dilute solution. The relative lowering of vapour pressure for the solution B has twice the relative lowering of vapour pressure for the solut ion A. If MA and MB are the mo lecular weights of so lvents A and B respectively, then:

Test: Colligative Properties - 1 - Question 17

An ideal solution has two components A and B. A is more volatile than B, i. e., and also If XA and YA are mole fractions of components A in liquid and vapour phases, then

Test: Colligative Properties - 1 - Question 18

At 25°C, the vapour pressure of pure liquid A (mol. wt. = 40) is 100 torr, while that of pure liquid B is 40 torr, (mol. wt. = 80). The vapour pressure at 25°C of a solution containing 20 g of each A and B is:

Test: Colligative Properties - 1 - Question 19

Two liquids A and B from ideal solutions. At 300 K, the vapour pressure of solution containing 1 mole of A and 3 mole of B is 550 mm Hg. At the same temperature, if one more mole of B is added this solution, the vapour pressure of the solution increases by 10 mm Hg. Determine the vapour pressure of A and B in their pure states (in mm Hg):

Test: Colligative Properties - 1 - Question 20

Two liquids A and B have vapour pressure in the ratio  at a certain temperature. Assume A and B form an ideal solution and the ratio of mole fractions A and B in the vapour phase is 4:3. Then the mole fraction of B in the solution at the same temperature is:

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