Raoult’s Law NEET Questions

Physical Chemistry - Solutions

Raoult’s Law MCQ Questions


13.
Vapour pressures of pure benzene and toluene at 300 K are 50.71 mm Hg and 32.06 mm Hg. If x_benzene = 0.5, total vapour pressure of solution is:
A.
32.06 mm Hg
B.
41.385 mm Hg
C.
50.71 mm Hg
D.
82.77 mm Hg
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ANSWER :
B. 41.385 mm Hg
14.
100 g of liquid A (M=140) is dissolved in 1000 g of liquid B (M=180). p°_B = 500 torr, p_total = 475 torr. Then vapour pressure of pure A is:
A.
280.7 torr
B.
475.0 torr
C.
500.0 torr
D.
180.0 torr
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ANSWER :
A. 280.7 torr
15.
Two liquids X and Y form ideal solution. Pure X has vapour pressure 300 mm Hg and pure Y has 150 mm Hg. Total vapour pressure of equimolar mixture is:
A.
225 mm Hg
B.
150 mm Hg
C.
300 mm Hg
D.
450 mm Hg
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ANSWER :
A. 225 mm Hg
16.
If y₁ and y₂ are mole fractions of components in vapour phase, by Dalton's law:
A.
p₁ = y₁ × p_total
B.
p₁ = y₁ + p_total
C.
p₁ = y₂ × p_total
D.
p₁ = y₁ × p₁°
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ANSWER :
A. p₁ = y₁ × p_total
17.
At equilibrium between liquid and vapour phase, the vapour phase is always:
A.
Pure in only one component
B.
Richer in the more volatile component
C.
Richer in the less volatile component
D.
Of identical composition as liquid
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ANSWER :
B. Richer in the more volatile component
18.
For solution of CHCl₃ (p°=200) and CH₂Cl₂ (p°=415 mm Hg) with x_CH2Cl2 = 0.688, the mole fraction of CH₂Cl₂ in vapour phase (y_CH2Cl2) is:
A.
0.688
B.
0.82
C.
0.18
D.
0.50
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ANSWER :
B. 0.82