Colligative Properties of Dilute Solutions (a Relative Lowering of Vapour Pressure, Depression of Freezing Point...) NEET Questions

Physical Chemistry - Solutions

Colligative Properties of Dilute Solutions (a Relative Lowering of Vapour Pressure, Depression of Freezing Point...) MCQ Questions


1.
Colligative properties of a solution depend on:
A.
Volatility of the solute
B.
Mass of the solute only
C.
Number of solute particles relative to total particles, irrespective of their nature
D.
Chemical nature of the solute
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ANSWER :
C. Number of solute particles relative to total particles, irrespective of their nature
2.
Which of the following is NOT a colligative property?
A.
Relative lowering of vapour pressure
B.
Elevation of boiling point
C.
Optical rotation
D.
Osmotic pressure
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ANSWER :
C. Optical rotation
3.
Colligative properties are observed when:
A.
A volatile solute is dissolved in a volatile solvent
B.
Two gases are mixed
C.
Two immiscible liquids are mixed
D.
A non-volatile solute is dissolved in a volatile solvent
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ANSWER :
D. A non-volatile solute is dissolved in a volatile solvent
4.
If equal moles of glucose, urea, and sucrose are dissolved in equal volumes of water, the colligative properties of the three solutions will be:
A.
In the order: urea > glucose > sucrose
B.
Equal
C.
In the order: sucrose > glucose > urea
D.
Different in unpredictable manner
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ANSWER :
B. Equal
5.
According to Raoult's law for solutions of non-volatile solutes, the relative lowering of vapour pressure equals:
A.
Mole fraction of the solvent
B.
Molality of the solute
C.
Mole fraction of the solute
D.
Molarity of the solute
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ANSWER :
C. Mole fraction of the solute
6.
The vapour pressure of pure water at 25°C is 23.8 mm Hg. The vapour pressure of an aqueous solution of a non-volatile solute with x₂ = 0.05 is:
A.
1.19 mm Hg
B.
23.8 mm Hg
C.
22.61 mm Hg
D.
21.42 mm Hg
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ANSWER :
C. 22.61 mm Hg