A$Q = W = 0$ and $\Delta \,{E_{{\mathop{\rm int}} }} = 0$
a (a)
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A given mass of a gas expands from a state $A$ to the state $B$ by three paths $1, 2$ and $3$ as shown in $T-V$ indicator diagram. If $W_1, W_2$ and $W_3$ respectively be the work done by the gas along the three paths, then
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