Gases Quiz - CBSE Class 12 Chemistry

Free practice quiz: Gases (CBSE Class 12 Chemistry). 10 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

Sample questions

1. Which of the following is NOT a characteristic of an ideal gas?

   1. Particles have negligible volume
   2. Particles have no intermolecular forces
   3. Particles are in constant, random motion
   4. Particles have significant intermolecular forces
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   Answer: D. Particles have significant intermolecular forces

   Ideal gases are theoretical constructs assuming particles have negligible volume and no intermolecular forces.

2. According to Boyle's Law, what happens to the volume of a gas if the pressure is doubled while temperature remains constant?

   1. The volume doubles
   2. The volume is halved
   3. The volume remains the same
   4. The volume increases slightly
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   Answer: B. The volume is halved

   Boyle's Law states that volume is inversely proportional to pressure (at constant temperature).

3. What is the relationship between the average kinetic energy of gas molecules and temperature?

   1. Directly proportional
   2. Inversely proportional
   3. No relationship
   4. Exponential relationship
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   Answer: A. Directly proportional

   Average kinetic energy is directly proportional to absolute temperature.

4. Explain the significance of the van der Waals equation in describing real gases.

   1. It accounts for intermolecular forces and molecular volume
   2. It simplifies the ideal gas law for all conditions
   3. It ignores intermolecular forces and molecular volume
   4. It is only applicable to ideal gases
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   Answer: A. It accounts for intermolecular forces and molecular volume

   The van der Waals equation corrects for the limitations of the ideal gas law by incorporating terms for intermolecular attractions and the volume occupied by gas molecules.

5. A gas is collected over water at 25°C and 760 mmHg. The partial pressure of water vapor at 25°C is 23.8 mmHg. What is the pressure of the dry gas?

   1. 736.2 mmHg
   2. 783.8 mmHg
   3. 760 mmHg
   4. 23.8 mmHg
   Show answer

   Answer: A. 736.2 mmHg

   Dalton's Law: Total pressure = pressure of dry gas + pressure of water vapor. Solve for the pressure of the dry gas.

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