Question 1

Which of the following best describes a solution that shows positive deviation from Raoult’s Law?

Accepted Answer

The intermolecular forces between unlike molecules are weaker than those between like molecules.

Question 2

A mixture of acetone and carbon disulphide exhibits positive deviation from Raoult’s Law. Which of the following is the most likely explanation?

Accepted Answer

London dispersion forces dominate, and the unlike interactions are weaker, destabilizing the mixture.

Question 3

Which equation correctly represents Raoult’s Law for the partial pressure of component $$i in an $$ideal solution?

Accepted Answer

$$p_i = p_i^* x_i$$

Question 4

In a sufficiently dilute solution, which law does the solute obey?

Accepted Answer

Henry’s Law

Question 5

A mixture of acetone and chloroform shows negative deviation from Raoult’s Law. What is the main reason for this behavior?

Accepted Answer

The formation of hydrogen bonds between acetone and chloroform stabilizes the mixture.

Question 6

Which of the following statements is TRUE for an ideally dilute solution?

Accepted Answer

The solvent obeys Raoult’s Law and the solute obeys Henry’s Law.

Question 7

Given a binary solution where the partial pressure of component A is $$p_A = p_A^* x_A$$ and the partial pressure of component B is $$p_B = K_B x_B$$, what can you infer about the solution?

Accepted Answer

Component A is the solvent and B is the solute in a dilute solution.

Question 8

Which of the following is a characteristic of a solution that shows negative deviation from Raoult’s Law?

Accepted Answer

The intermolecular forces between unlike molecules are stronger than those between like molecules.

Question 9

Which of the following best describes the behavior of the major component (solvent) in a sufficiently dilute solution?

Accepted Answer

It obeys Raoult’s Law.

Question 10

A chemist mixes acetone and chloroform and observes a lower total vapor pressure than predicted by Raoult’s Law. What is the most likely explanation?

Accepted Answer

The mixture is stabilized by strong hydrogen bonding between acetone and chloroform.

Question 11

Which of the following is NOT a requirement for a solution to be considered ideally dilute?

Accepted Answer

The solution is ideal at all concentrations.

Question 12

Which of the following equations represents Henry’s Law for the partial pressure of a solute in a dilute solution?

Accepted Answer

$$p_i = K_i x_i$$

Question 13

Which real-world scenario is most likely to result in a positive deviation from Raoult’s Law?

Accepted Answer

Mixing acetone and carbon disulphide, where unlike interactions are weaker.

Question 14

Which of the following best explains why the vapor pressure of a solution showing positive deviation from Raoult’s Law is higher than predicted?

Accepted Answer

The unlike intermolecular forces are weaker, making it easier for molecules to escape into the vapor phase.

Question 15

Which of the following mixtures is most likely to show negative deviation from Raoult’s Law?

Accepted Answer

Acetone and chloroform

Question 16

A solution is prepared by mixing two volatile liquids. The total vapor pressure is found to be lower than that predicted by Raoult’s Law. What does this indicate about the interactions between the two components?

Accepted Answer

The interactions between unlike molecules are stronger than those between like molecules.

Question 17

Which of the following statements about ideally dilute solutions is correct?

Accepted Answer

In ideally dilute solutions, the solvent obeys Raoult’s Law and the solute obeys Henry’s Law.

Question 18

Which of the following best describes the behavior of a nonideal solution?

Accepted Answer

It shows deviations from Raoult’s Law due to differences in intermolecular forces.

Deviations from Raoult’s Law: Nonideal Solutions and Their Thermodynamic Behavior

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