Assertion (A): At absolute zero, the volume of an ideal gas becomes zero. Reason (R): At absolute zero, the kinetic energy of the gas molecules is zero.
A. Both A and R are true but R is NOT the correct explanation of A.
B. A is false but R is true.
C. Both A and R are true and R is the correct explanation of A.
D. A is true but R is false.
Answer: Option A
Solution (By JKSSB Mock Tests)
According to Charles's Law (V ∝ T), extrapolating the volume-temperature graph of an ideal gas to absolute zero (0 K) yields a volume of zero. At 0 K, the theoretical kinetic energy of molecules is zero, meaning they stop moving. Both are true, but the zero volume is a mathematical extrapolation of the gas law, not a direct physical consequence of zero kinetic energy alone, as real gases liquefy first.
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