Raoult’s Law NEET Questions

Physical Chemistry - Solutions

Raoult’s Law MCQ Questions


13.
The vapour pressure of pure benzene is 640 mmHg. A non-volatile solute is added such that the vapour pressure of the solution becomes 512 mmHg. The mole fraction of the solute is

NEET - 2021

A.
0.1
B.
0.2
C.
0.25
D.
0.3
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ANSWER :
C. 0.25
14.
What is the unit of vapor pressure?
A.
Pa
B.
mol/L
C.
g/L
D.
mol/kg
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ANSWER :
A. Pa
15.
According to Raoult’s law, the relative lowering of vapour pressure is equal to

NEET - 2020

A.
the molal concentration of solute
B.
mole fraction of solvent
C.
mole fraction of solute
D.
vapour pressure of solute
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ANSWER :
C. mole fraction of solute
16.
Which of the following factors affects vapor pressure?
A.
Temperature
B.
Volume
C.
Pressure
D.
Molarity
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ANSWER :
A. Temperature
17.
If a solution follows Raoult’s law, what is the nature of its enthalpy change on mixing?
A.
Zero
B.
Positive
C.
Negative
D.
Infinite
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ANSWER :
A. Zero
18.
The vapour pressure of a dilute solution is always

NEET - 2015

A.
greater than that of pure solvent
B.
equal to that of pure solvent
C.
less than that of pure solvent
D.
dependent on solute volatility
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ANSWER :
C. less than that of pure solvent