Chemistry-(general)
NEET Chemistry (general) Assertion Reason Question
Type: Assertion Reason-assertion-Medium-Class 11
Assertion (A): In an isothermal expansion of an ideal gas into a vacuum, the internal energy change is zero. | Reason (R): During isothermal expansion into a vacuum, no work is done on or by the system.
A
Both A and R are true and R is the correct explanation of A.
B
Both A and R are true but R is not the correct explanation of A.
C
A is true but R is false.
D
A is false.
Correct Answer
Option A
Detailed Explanation
In the NCERT context, for isothermal expansion of an ideal gas into a vacuum, it is stated that w = 0 since p_ex = 0 and Joule determined experimentally that q = 0; therefore, ΔU = 0. This means no work is done and internal energy remains constant.
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