In adiabatic expansion
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(b) In case of adiabatic expansion $\Delta W$= positive and $\Delta Q = 0$
from FLOT $\Delta Q = \Delta U + \Delta W$
from FLOT $\Delta Q = \Delta U + \Delta W$
==> $\Delta U = - \Delta W$ i.e., $\Delta U$will be negative.
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