Question

Assertion :

Absolute zero is a theoretically possible temperature at which the volume of the gas becomes zero.

Reason :

The total kinetic energy of the molecule is zero at this temperature.

• A. Both assertion and reason are correct and reason is the correct explanation of the assertion.
• B. Both assertion and reason are correct, but reason is not the correct explanation of the assertion.
• C. Assertion is correct, but reason is incorrect.
• D. Assertion is incorrect, but reason is correct.
• E. Both assertion and reason are incorrect.

Answer 1

Answer: (B)

Both assertion and reason are correct, but reason is not the correct explanation of the assertion.

It appeared that an “ideal gas” at constant pressure would reach zero volume at what is now called the absolute zero of temperature. Any real gas actually condenses to a liquid or a solid at some temperature higher than absolute zero; therefore, the ideal gas law is only an approximation to real gas behavior.

Absolute zero is the theoretical point where all molecular motion ceases and they are at complete rest (except for quantum mechanical motion). According to kinetic theory, there should be no movement of individual molecules at absolute zero, so any material at this temperature would be solid.

Hence, option B is the correct answer.