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 -
(1) C and D respectively
(2) D and C respectively
(3) A and B respectively
(4) B and A respectively
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(3) 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.