Four curves $A, B, C$ and $D$ are drawn in the adjoining figure for a given amount of gas. The curves which represent adiabatic and isothermal changes are
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(c)As we know that slope of isothermal and adiabatic curves are always negative and slope of adiabatic curve is always greater than that of isothermal curve
Hence in the given graph curve $A$ and $B$ represents adiabatic and isothermal changes respectively.
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