Direction for: In each of the following questions a statement of Assertion is given followed by a corresponding statement of Reason just below it. Of the statements mark the correct answer as
Assertion: The heat adsorbed during isothermal expansion of an ideal gas against vacuum is zero. Reason: The volume occupied by the molecule is zero.A) If both Assertion: and Reason: are true and the Reason: is the correct explanation of the Assertion:
B) If both Assertion: and Reason: are true but the Reason: is not the correct explanation of the Assertion:
C) If Assertion: is true but Reason: is false
D) If both Assertion: and Reason: are false
Correct Answer: C
Solution :
In isothermal expansion, \[\Delta T=0\] and thus \[\Delta E=0\] and in vacuum, no work is done against surroundings thus, \[W=0\] \[\Delta E=Q+W\] \[0=Q+0\] \[Q=0\] Molecules of ideal gas occupy some volume, Here, Reason: is not true.
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