Raoult’s Law NEET Questions

Physical Chemistry - Solutions

Raoult’s Law MCQ Questions


7.
p_total can also be expressed in terms of x₂ alone as:
A.
p₁° + (p₂° + p₁°)x₂
B.
p₁° + (p₂° - p₁°)x₂
C.
p₂° - (p₂° - p₁°)x₂
D.
p₂° + (p₁° - p₂°)x₂
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ANSWER :
B. p₁° + (p₂° - p₁°)x₂
8.
A plot of total vapour pressure vs mole fraction (for an ideal binary liquid solution) is:
A.
A hyperbola
B.
A straight line
C.
An exponential curve
D.
A parabolic curve
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ANSWER :
B. A straight line
9.
If component 1 is less volatile than component 2 (p₁° < p₂°), the minimum value of p_total in the binary solution corresponds to:
A.
x₂ = 1 (p_total = p₂°)
B.
x₁ = 1 (p_total = p₁°)
C.
x₁ = 0
D.
x₁ = x₂ = 0.5
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ANSWER :
B. x₁ = 1 (p_total = p₁°)
10.
Vapour pressures of pure CHCl₃ and CH₂Cl₂ at 298 K are 200 mm Hg and 415 mm Hg. For 25.5 g CHCl₃ + 40 g CH₂Cl₂, total vapour pressure is:
A.
347.9 mm Hg
B.
307.5 mm Hg
C.
200.0 mm Hg
D.
415.0 mm Hg
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ANSWER :
A. 347.9 mm Hg
11.
Heptane and octane form an ideal solution. At 373 K, p°(heptane) = 105.2 kPa, p°(octane) = 46.8 kPa. For 26 g heptane + 35 g octane, p_total is approximately:
A.
73.08 kPa
B.
76.00 kPa
C.
152.00 kPa
D.
60.10 kPa
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ANSWER :
A. 73.08 kPa
12.
Vapour pressure of pure liquids A and B at 350 K are 450 and 700 mm Hg respectively. If p_total = 600 mm Hg, mole fraction of A in liquid is:
A.
0.50
B.
0.60
C.
0.30
D.
0.40
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ANSWER :
D. 0.40