For the cyclic process given below, which of the following relations are correct? Path 1→2 is Revers — Thermodynamics and Thermochemistry Chemistry Question

💡 Solution & Explanation

Since S is a state function, Δ S along the reversible path 1→2 equals $S_2$-S1 = int_1^2 dq_rev/T (A correct). For irreversible path 2→1: S1-$S_2$ > int_2^1 dq_irr/T (B incorrect). For the entire cycle, Δ S_cycle=0 (state function). By Clausius inequality, for a cycle with an irreversible step: oint dq/T < 0, so int_1^2 dq_rev/T + int_2^1 dq_irr/T < 0. Thus Δ S_cycle = 0 > int_1^2 dq_rev/T + int_2^1 dq_irr/T (D correct, C incorrect).