NEET Chemistry: Solutions Practice Questions
11 free multiple-choice questions on Solutions for NEET Chemistry, each with the correct answer and a step-by-step explanation. Attempt a question, then reveal the solution to check your reasoning.
Practice thousands more Solutions questions in the app →Q1. In an ideal solution, the partial vapor pressure of component A above the solution is directly proportional to which quantity?
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Correct answer: C — Mole fraction of A
According to Raoult's Law for ideal solutions, the partial vapor pressure of a component is proportional to its mole fraction in the liquid phase (P_A = X_A P_Aᵒ).
Q2. If the vapor pressure of a solution is lower than that of the pure solvent, which colligative property is being described?
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Correct answer: D — Relative Lowering of Vapor Pressure
When a non-volatile solute is added to a solvent, it lowers the vapor pressure above the liquid surface. This is described by the concept of Relative Lowering of Vapor Pressure.
Q3. Which concentration unit is based on the mass of the solvent and is typically used when dealing with colligative properties?
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Correct answer: C — Molality
Molality (moles of solute per kg of solvent) is the standard unit used for colligative properties because it depends on the amount of solute particles, not mass, which is temperature independent.
Q4. The presence of an electrolyte (like NaCl) in water causes the freezing point to be depressed. This depression is related to the number of particles formed when the solute dissolves. This concept is governed by which factor?
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Correct answer: C — van't Hoff factor
The depression of freezing point is related to the total number of solute particles. This relationship is quantified by the van't Hoff factor (i), which accounts for dissociation.
Q5. If a solution is prepared by mixing two liquids, A and B, Raoult's law implies that the partial vapor pressure of A is given by:
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Correct answer: A — P_A = X_A P_Aᵒ
Raoult's Law states that the partial vapor pressure of a component is equal to the mole fraction of that component multiplied by its vapor pressure over the pure liquid (P_A = X_A P_Aᵒ).
Q6. In a solution formed by two volatile liquids, A and B, the vapor pressure of the resulting solution is lower than that of the pure liquid A. This phenomenon is described by which principle of colligative properties?
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Correct answer: B — Raoult's Law
Lowering of vapor pressure due to the presence of a non-volatile solute is directly described by Raoult's Law. Raoult's Law states that the partial vapor pressure of a solvent above a solution is equal to the mole fraction of that solvent in the solution multiplied by the vapor pressure of the pure solvent.
Q7. If a solution exhibits a relative lowering of vapor pressure of 20%, what is the mole fraction of the solvent in the solution?
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Correct answer: D — 0.80
If the vapor pressure is lowered by 20%, it means the mole fraction of the solvent is 1 - 0.20 = 0.80.
Q8. The depression in the freezing point of a solution is directly proportional to the molality of the solute. This statement is fundamentally related to which concept?
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Correct answer: B — Colligative Properties
Freezing point depression is a colligative property, meaning it depends on the number of solute particles present in a given amount of solvent, which is directly proportional to molality (or mole fraction).
Q9. Which of the following is the correct unit for expressing the mole fraction of a component in a solution?
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Correct answer: B — Mole fraction
Mole fraction is defined as the ratio of the moles of a specific component to the total moles of all components in the solution.
Q10. Which of the following colligative properties depends solely on the number of solute particles present in a given amount of solvent?
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Correct answer: D — All of the above
Colligative properties (like vapor pressure lowering and boiling point elevation) are directly proportional to the concentration of solute particles, making them dependent only on the number of solute particles, not their nature. Osmotic pressure is also based on particle concentration.
Q11. Which colligative property is directly proportional to the concentration of solute particles in a solution?
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Correct answer: B — Osmotic Pressure
Colligative properties (like vapor pressure lowering and osmotic pressure) depend solely on the number of solute particles present in a given amount of solvent, which is directly related to concentration.
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