Match each combination of signs in Column I with the spontaneity behaviour in Column II: Column I (Signs of Δ H and Δ S ) Column II (Spontaneity) (P) Δ H = − , Δ S = + (1) Spontaneous at all temperatu

Question

Match each combination of signs in Column I with the spontaneity behaviour in Column II:

Column I (Signs of $Δ H$ and $Δ S$ )	Column II (Spontaneity)
(P) $Δ H = -, Δ S = +$	(1) Spontaneous at all temperatures
(Q) $Δ H = +, Δ S = +$	(2) Spontaneous only at low temperature
(R) $Δ H = +, Δ S = -$	(3) Spontaneous only at high temperature
(S) $Δ H = -, Δ S = -$	(4) Non-spontaneous at all temperatures

Choose the option with the correct matching:

TestHub · Accepted Answer

Δ G = Δ H − T Δ S . (P) both terms favour: Δ G < 0 always: (1). (Q) Δ G < 0 only when T Δ S > Δ H , i.e. high T : (3). (R) Δ G > 0 always: (4). (S) Δ G < 0 only when ∣Δ H ∣ > T ∣Δ S ∣ , i.e. low T : (2). Correct matching: P→1; Q→3; R→4; S→2. Answer: (D).

Chemistry - Thermodynamics - II Question with Solution | TestHub

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