NEET UG CHEMISTRY Multiple Choice Questions (MCQs)

NEET UG Physical Chemistry MCQs (Unit 5: Solutions)

61. Which of the following expresses the concentration of a solution as the number of moles of solute per kilogram of solvent?
    a) Molarity
    b) Molality
    c) Mole fraction
    d) Percentage by mass
    Answer: b) Molality
62. Raoult’s Law applies to:
    a) Ideal solutions only
    b) Non-ideal solutions only
    c) Both ideal and non-ideal solutions
    d) Saturated solutions
    Answer: a) Ideal solutions only
63. The vapor pressure of a solution is always lower than that of the pure solvent due to:
    a) Decrease in the number of molecules of solvent in the solution
    b) Increase in the number of molecules of solvent in the solution
    c) Decrease in the surface area
    d) Increase in the temperature of the solution
    Answer: a) Decrease in the number of molecules of solvent in the solution
64. Which of the following is a colligative property of dilute solutions?
    a) Boiling point
    b) Vapor pressure
    c) Freezing point depression
    d) Density
    Answer: c) Freezing point depression
65. The formula for the relative lowering of vapor pressure is:
    a) \(\dfrac{p_0 - p}{p_0}\)
    b) \(\dfrac{p_0 + p}{p_0}\)
    c) \(\dfrac{p_0}{p_0 - p}\)
    d) \(\dfrac{p}{p_0}\)
    Answer: a) \(\dfrac{p_0 - p}{p_0}\)
66. Which of the following is an example of a non-ideal solution?
    a) Solution of water and ethanol
    b) Solution of NaCl in water
    c) Solution of sugar in water
    d) Solution of benzene and toluene
    Answer: a) Solution of water and ethanol
67. The elevation in boiling point (\(\Delta T_b\)) of a solution is directly proportional to:
    a) The number of moles of solute
    b) The square of the molar mass of solute
    c) The number of moles of solvent
    d) The molar mass of the solvent
    Answer: a) The number of moles of solute
68. Osmotic pressure is a colligative property that depends on:
    a) The nature of the solute
    b) The temperature and the number of solute particles
    c) The volume of the solvent
    d) The color of the solution
    Answer: b) The temperature and the number of solute particles
69. Which of the following is a correct formula for calculating molar mass using colligative properties?
    a) \( M = \dfrac{w}{m \cdot \Delta T_f} \)
    b) \( M = \dfrac{m \cdot \Delta T_f}{w} \)
    c) \( M = \dfrac{m \cdot \Delta T_b}{w} \)
    d) \( M = \dfrac{w \cdot \Delta T_b}{m} \)
    Answer: b) \( M = \dfrac{m \cdot \Delta T_f}{w} \)
70. The van’t Hoff factor (i) represents:
    a) The number of solute molecules in a solution
    b) The ratio of the actual to ideal colligative property values
    c) The number of solvent molecules in a solution
    d) The boiling point elevation of the solution
    Answer: b) The ratio of the actual to ideal colligative property values
71. The ideal solution is characterized by:
    a) A positive deviation from Raoult’s law
    b) A negative deviation from Raoult’s law
    c) No deviation from Raoult’s law
    d) High solubility of solute in solvent
    Answer: c) No deviation from Raoult’s law
72. If the boiling point of a solution is higher than that of the pure solvent, the solution:
    a) Has a positive deviation from Raoult’s law
    b) Has a negative deviation from Raoult’s law
    c) Is an ideal solution
    d) Has lower vapor pressure than the pure solvent
    Answer: a) Has a positive deviation from Raoult’s law
73. Which of the following increases the osmotic pressure of a solution?
    a) Increase in solute concentration
    b) Decrease in temperature
    c) Decrease in the number of solute particles
    d) Increase in the number of solvent molecules
    Answer: a) Increase in solute concentration
74. If the freezing point depression is observed to be greater than expected, it indicates that:
    a) The solution is ideal
    b) The solution is non-ideal
    c) The van’t Hoff factor is less than 1
    d) The molar mass of the solute is greater than expected
    Answer: b) The solution is non-ideal
75. What is the unit of molarity (M)?
    a) mol/kg
    b) mol/L
    c) g/mL
    d) mol/mol
    Answer: b) mol/L

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