Explore topic-wise MCQs in Chemistry Questions and Answers.

This section includes 5 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry Questions and Answers knowledge and support exam preparation. Choose a topic below to get started.

1.

A volatile liquid with vapor pressure 85 kPa (at sea level, 25° C) is taken to the peak of Mt. Everest. Which of the following is true?

A. The vapor pressure of the solution decreases
B. The solution will condense quickly than when at sea level
C. The solution will vaporize quickly than when at sea level
D. The vapor pressure of the solution increases
Answer» E.
Discussion
2.

Considering a binary solution of components A and B obeys Raoult’s law, which of the following is true?

A. Total vapor pressure cannot be related to mole fraction of only one component
B. Total vapor pressure of one component varies non-linearly with another component
C. A plot of vapor pressures of both components gives a linear plot
D. Total vapor pressure of solution always decreases with increase in mole fraction of a component
Answer» D. Total vapor pressure of solution always decreases with increase in mole fraction of a component
Discussion
3.

If ethanol and chloroform are present in a molar ratio of 2:3 then what is the vapor pressure at 20° C if vapor pressures of pure liquids are 5.95 kPa and 21.17 kPa, respectively?

A. 16.692 kPa
B. 15.082 kPa
C. 8.731 kPa
D. 12.038 kPa
Answer» C. 8.731 kPa
Discussion
4.

“Total pressure of gas mixture is the sum of individual pressures”. Which law is reflected in this statement?

A. Amagat’s law
B. Raoult’s law
C. Dalton’s law
D. Henry’s law
Answer» D. Henry’s law
Discussion
5.

What phenomenon occurs when a solution’s equilibrium vapor pressure equals the surrounding atmospheric pressure?

A. Boiling
B. Melting
C. Condensation
D. Sublimation
Answer» B. Melting
Discussion