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


13.
Vapour pressures of pure CHCl₃ and CH₂Cl₂ at 298 K are 200 mm Hg and 415 mm Hg respectively. For an equimolar mixture, which component is richer in the vapour phase?
A.
Both are equal
B.
CHCl₃
C.
CH₂Cl₂
D.
Cannot be determined
😑 View Answer Rough Work Error
ANSWER :
C. CH₂Cl₂
14.
In an ideal solution, if x₁ = x₂ = 0.5 and p₁° = 100 mm Hg, p₂° = 300 mm Hg, then the mole fraction of component 2 in vapour phase (y₂) is:
A.
0.60
B.
0.50
C.
0.75
D.
0.25
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ANSWER :
C. 0.75
15.
A solution showing positive deviation from Raoult's law has:
A.
Vapour pressure equal to that predicted by Raoult's law
B.
Vapour pressure lower than predicted by Raoult's law
C.
Zero vapour pressure
D.
Vapour pressure higher than predicted by Raoult's law
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ANSWER :
D. Vapour pressure higher than predicted by Raoult's law
16.
For a solution showing positive deviation from Raoult's law, the enthalpy of mixing (ΔmixH) is:
A.
Negative (exothermic)
B.
Positive (endothermic)
C.
Zero
D.
Cannot be determined
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ANSWER :
B. Positive (endothermic)
17.
Which of the following pairs shows positive deviation from Raoult's law?
A.
Ethanol and acetone
B.
Chloroform and acetone
C.
Phenol and aniline
D.
Acetic acid and pyridine
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ANSWER :
A. Ethanol and acetone
18.
A mixture of carbon disulphide and acetone shows positive deviation from Raoult's law because:
A.
Dipolar A-B interactions are weaker than A-A and B-B interactions
B.
Both components are non-polar
C.
Hydrogen bonding occurs between solute and solvent
D.
A-B interactions are stronger than A-A and B-B interactions
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ANSWER :
A. Dipolar A-B interactions are weaker than A-A and B-B interactions