Answer:
(i) Wall is adiabatic, i.e.,\[q=0\]
\[\therefore \]\[\Delta
U=w,\]here the work is adiabatic.
(ii) The
wall is diathermic or thermally conducting,
w=0
\[\therefore
\]\[\Delta U=-q\] (Exothermic process)
(iii) The
system has a rigid and diathermic wall,
\[q=+ve,\,\,w=-ve\]
\[\therefore \]\[\Delta
U=q-w\]
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