Raoult’s Law NEET Questions

Physical Chemistry - Solutions

Raoult’s Law MCQ Questions


1.
Raoult's law for a solution of two volatile liquids states that the partial vapour pressure of each component is:
A.
Inversely proportional to its mole fraction in solution
B.
Directly proportional to its mole fraction in solution
C.
Independent of mole fraction
D.
Directly proportional to its mass fraction in solution
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ANSWER :
B. Directly proportional to its mole fraction in solution
2.
According to Raoult's law for a binary solution of two volatile liquids, p₁ equals:
A.
p₁° × x₁
B.
p₁° + x₁
C.
p₁° / x₁
D.
p₁° × x₂
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ANSWER :
A. p₁° × x₁
3.
Raoult's law in its general form (for any solution) states that the partial vapour pressure of each volatile component is directly proportional to its:
A.
Mole fraction
B.
Molarity
C.
Mass percentage
D.
Molality
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ANSWER :
A. Mole fraction
4.
For a solution containing a non-volatile solute, Raoult's law reduces to:
A.
p_solution = x_solute × p°_solute
B.
p_solution = x_solvent × p°_solvent
C.
p_solution = x_solvent × p°_solute
D.
p_solution = x_solute × p°_solvent
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ANSWER :
B. p_solution = x_solvent × p°_solvent
5.
Who proposed Raoult's law?
A.
William Henry (1803)
B.
François-Marie Raoult (1886)
C.
John Dalton (1801)
D.
Jacobus van't Hoff (1880)
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ANSWER :
B. François-Marie Raoult (1886)
6.
For a binary solution of two volatile liquids, total vapour pressure (p_total) is given by:
A.
p₁° + p₂°
B.
p₁°x₂ + p₂°x₁
C.
p₁°x₁ + p₂°x₂
D.
(p₁° + p₂°)/2
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ANSWER :
C. p₁°x₁ + p₂°x₂