Comprehension
The properties which depend on the number of solute particles irrespective of their nature relative to the total numbers of particles in the solution are called colligative properties. These are relative lowering of vapour pressure, of the solvent, depression of freezing point of the solvent, elevation of boiling point of the solvent and osmotic pressure of the solution. All of their particles help in calculating the observed molar mass of the solute. Determination of osmatic pressure is considered best for the determination of molecular mass of the solute.
Question: 1

The binary liquid mixtures which show negative deviation from Raoulť's law are:
(A) n-hexane and n-heptone
(B) phenol and acetone
(C) Ethanol and acetone
(D) Chloroform and acetone
(E) Benzene and toluene
Choose the correct answer from the options given below:

Updated On: May 21, 2024
  • (A) and (B) only
  • (C) and (E) only
  • (B) and (D) only
  • (A) and (E) only
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The Correct Option is C

Solution and Explanation

The correct option is (C) : (B) and (D) only
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Question: 2

A solution of 12.5 g of an unknown solute in 170 g. Water gave a boiling point elevation of 0.63 K. kb for water is 0.53 K kg mol-1. The molar mass of the solute is:

Updated On: May 21, 2024
  • 61.85 g mol-1
  • 87.3 g mol
  • 13.9 g mol-1
  • 56.7 g mol-1
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The Correct Option is A

Solution and Explanation

The correct option is (A) : 61.85 g mol-1
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Question: 3

Which solution has the highest boiling point ?

Updated On: May 21, 2024
  • 0.1 m glucose
  • 0.5 m glucose
  • 1 m glucose
  • 2 m glucose
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The Correct Option is D

Solution and Explanation

The correct option is (D) : 2 m glucose
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Question: 4

Based on solute solvent interactions, arrange the following in order of increasing solubility in n-octane.
(A) Cycloheptane
(B) NaCl
(C) CH3OH
(D) CH₂CN
Choose the correct answer from the options given below :

Updated On: May 21, 2024
  • (D) < (C) < (B) < (A)
  • (B) < (C) < (D) < (A)
  • (A) < (D) < (C) < (B)
  • (B) < (A) < (D) < (C)
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The Correct Option is B

Solution and Explanation

The correct option is (B) : (B) < (C) < (D) < (A)
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Question: 5

A 1 litre solution of glucose containing 36 g of it has an osmotic pressure of 4.98 bar at 300 K. At the same temperature, the osmotic pressure of the solution is 1.52 bar. The concentration of the solution at 1.52 bar is:

Updated On: May 21, 2024
  • 0.0610 mol-1
  • 10.9 mol-1
  • 1.6 mol-1
  • 0.00610 mol-1
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The Correct Option is A

Solution and Explanation

The correct option is (A) : 0.0610 mol-1
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