Statement A: For an isothermal process (where the temperature remains constant) if heat is added to a system temperature will not increases. So, statement A is wrong.
Statement B: We know that,
Work done = force ×displacement
Volume = area ×displacement
Work done=pressure ×volume
Let change in the volume of system = ΔV = V2-V1
Thus, work done by the system W at constant pressure
W>0 and positive only when V2 > V1.
Therefore, statement B is correct.
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