A) \[\Delta U\ne 0,\,W=0\,and\,Q\ne 0\]
B) \[\Delta U\ne 0,\,W\ne 0\,and\,Q\ne 0\]
C) \[\Delta U\ne 0,\,W\ne 0\,and\,Q=0\]
D) \[\Delta U=0,\,W=0\,and\,Q=0\]
Correct Answer: D
Solution :
[d] For an isothermal expansion of an ideal gas \[\Delta U=0\] Since \[{{P}_{ext}}\]is zero in vacuum. \[W=-{{P}_{ext}}\Delta V=0\] \[\therefore Q=0\]
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