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Answer: Option 2
The slope of isothermal process in $$p-v$$ plane is \[\frac{{dP}}{{dV}} = \frac{{ - P}}{V}\] The slope of adiabatic process in $$P-V$$ plane is \[\frac{{dP}}{{dV}} = - \gamma \frac{P}{V}\] \[ \Rightarrow \] Slopes become equal when \[\gamma = 1\]
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