Solutions Practice Questions
NEET · Chemistry · 1592 free MCQs with instant results and detailed explanations.
1592
Total
352
Easy
713
Medium
527
Hard
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Topics in Solutions
Osmotic Pressure
378
Raoult's Law
398
Van't Hoff Factor
445
Colligative Properties
371
Sample Questions from Solutions
Here are 10 sample questions. Start a quiz to get randomized questions with scoring.
Q1
Easy
According to Raoult's Law, the vapor pressure of a solvent in a solution is affected by which of the following?
A.
The number of solute particles
B.
The temperature of the solution
C.
The molecular weight of the solute
D.
The color of the solute
Show Answer & Explanation
Correct Answer: A
Raoult's Law states that the vapor pressure of a solvent in a solution decreases as the number of solute particles increases. Thus, the correct answer is the number of solute particles.
Q2
Easy
If the vapor pressure of pure solvent A is 80 mmHg and that of solvent B is 40 mmHg, what is the total vapor pressure of an ideal solution containing equal molar amounts of A and B?
A.
60 mmHg
B.
80 mmHg
C.
40 mmHg
D.
50 mmHg
Show Answer & Explanation
Correct Answer: A
Using Raoult's Law, the partial vapor pressures of A and B can be calculated. Total vapor pressure = (0.5 * 80 mmHg) + (0.5 * 40 mmHg) = 40 + 20 = 60 mmHg.
Q3
Easy
Which of the following statements best describes the behavior of non-ideal solutions according to Raoult's Law?
A.
They have a linear relation between concentration and vapor pressure.
B.
They follow Raoult's Law strictly at all concentrations.
C.
They exhibit deviations from Raoult's Law.
D.
They have constant intermolecular forces.
Show Answer & Explanation
Correct Answer: C
Non-ideal solutions do not follow Raoult's Law strictly and exhibit deviations due to varying interactions between solute and solvent.
Q4
Medium
Which of the following statements is true about Raoult's Law?
A.
It applies only to ideal solutions.
B.
It states that the vapor pressure of a solution is equal to the vapor pressure of the solvent.
C.
It is applicable to all types of solutions.
D.
It is dependent on the nature of solute and solvent.
Show Answer & Explanation
Correct Answer: A
Raoult's Law is primarily applicable to ideal solutions where the interactions between different molecules are similar to those in pure substances.
Q5
Medium
A solution of 100 g of solute in 1 kg of solvent shows a vapor pressure of 50 mmHg. If the vapor pressure of the pure solvent is 80 mmHg, what is the mole fraction of the solute?
A.
0.25
B.
0.20
C.
0.15
D.
0.10
Show Answer & Explanation
Correct Answer: A
Using Raoult's Law, the mole fraction of solute can be derived from the decrease in vapor pressure. The mole fraction of solute is 0.25, calculated from the formula (P_pure - P_solution) / P_pure.
Q6
Medium
In a binary solution of A and B, if the mole fraction of B is increased, what happens to the vapor pressure of the solution according to Raoult's Law?
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes constant
Show Answer & Explanation
Correct Answer: B
As the mole fraction of B increases, the contribution of solvent A to the vapor pressure decreases, leading to a lower overall vapor pressure of the solution.
Q7
Medium
Which of the following conditions is necessary for a solution to obey Raoult's Law?
A.
Similar molecular size and shape of solute and solvent.
B.
High concentration of solute in the solution.
C.
Presence of strong intermolecular forces in the solvent.
D.
Different chemical nature of solute and solvent.
Show Answer & Explanation
Correct Answer: A
For Raoult's Law to hold true, the solute and solvent must have similar molecular characteristics to ensure ideal behavior.
Q8
Hard
A solution is prepared by mixing 50 g of a non-volatile solute with 200 g of a solvent. If the vapor pressure of the pure solvent is 80 mmHg, what is the vapor pressure of the solution at the same temperature?
A.
60 mmHg
B.
70 mmHg
C.
75 mmHg
D.
80 mmHg
Show Answer & Explanation
Correct Answer: A
Using Raoult's Law, the vapor pressure of the solution can be calculated by the formula: P_solution = X_solvent * PĀ°_solvent. The mole fraction of the solvent is calculated, leading to a vapor pressure of 60 mmHg.
Q9
Hard
Which of the following statements about Raoult's Law is NOT true?
A.
It applies only to ideal solutions.
B.
The presence of a solute always increases the vapor pressure of the solvent.
C.
Vapor pressure lowering occurs due to solute-solvent interactions.
D.
Raoult's Law can predict the vapor pressure of a solution quantitatively.
Show Answer & Explanation
Correct Answer: B
Statement B is incorrect because the presence of a solute actually lowers the vapor pressure of the solvent, contrary to what is stated.
Q10
Hard
A mixture contains 40 g of component A (molar mass = 60 g/mol) and 60 g of component B (molar mass = 90 g/mol). What is the mole fraction of component A in the mixture?
A.
0.40
B.
0.45
C.
0.60
D.
0.67
Show Answer & Explanation
Correct Answer: B
Moles of A = 40 g / 60 g/mol = 0.67 mol and moles of B = 60 g / 90 g/mol = 0.67 mol. The mole fraction of A, X_A = moles of A / (moles of A + moles of B) = 0.67 / (0.67 + 0.67) = 0.45.
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This page contains 1592 practice MCQs for the chapter Solutions in NEET Chemistry. The questions are organized by difficulty ā 352 easy, 713 medium, 527 hard ā so you can choose the right level for your preparation.
Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit. This chapter covers 4 topics, giving you comprehensive coverage of the entire chapter.