Vapour Pressure - Composition, Plots for Ideal and Non-Ideal Solutions NEET Questions

Physical Chemistry - Solutions

Vapour Pressure - Composition, Plots for Ideal and Non-Ideal Solutions MCQ Questions


1.
According to Raoult's law, for a solution of two volatile liquids, the partial vapour pressure of each component is directly proportional to its:
A.
Molality in the solution
B.
Mass fraction in the solution
C.
Volume fraction in the solution
D.
Mole fraction in the solution
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ANSWER :
D. Mole fraction in the solution
2.
For an ideal binary solution of two volatile liquids 1 and 2, the total vapour pressure p_total is given by:
A.
p_total = p₁°/x₁ + p₂°/x₂
B.
p_total = p₁°x₁ + p₂°x₂
C.
p_total = (p₁° + p₂°)/(x₁ + x₂)
D.
p_total = p₁° + p₂°
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ANSWER :
B. p_total = p₁°x₁ + p₂°x₂
3.
For an ideal solution, which of the following is NOT a characteristic property?
A.
ΔmixV = 0
B.
ΔmixH > 0 and ΔmixV > 0
C.
ΔmixH = 0
D.
Obeys Raoult's law over the entire concentration range
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ANSWER :
B. ΔmixH > 0 and ΔmixV > 0
4.
Which of the following pairs forms a nearly ideal solution?
A.
n-Hexane and n-heptane
B.
Ethanol and water
C.
Chloroform and acetone
D.
Phenol and aniline
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ANSWER :
A. n-Hexane and n-heptane
5.
In an ideal solution of components A and B, the intermolecular interactions A-B are:
A.
Much weaker than A-A and B-B interactions
B.
Zero, with no interaction at all
C.
Nearly equal to A-A and B-B interactions
D.
Much stronger than A-A and B-B interactions
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ANSWER :
C. Nearly equal to A-A and B-B interactions
6.
The plot of vapour pressure versus mole fraction for an ideal solution is:
A.
A straight line
B.
A hyperbola
C.
A parabola opening upward
D.
An exponential curve
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ANSWER :
A. A straight line