List-I List-II (P) O 2 ( g ) (1) Δ f H o = + ve Δ f S o = + ve (Q) O 3 ( g ) (2) Δ f H ∘ = − ve Δ f S ∘ = − ve (R) Br 2 ( g ) (3) Δ f H 0 = + ve Δ f S 0 = − ve (S) H 2 ( ℓ ) (4) Δ f H ∘ = 0 Δ f S ∘ = 0 Code : P Q R S

Chemistry - Thermochemistry Question with Solution | TestHub

ChemistryThermochemistryEnthalpy of FormationMedium2 minQB

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List-I List-II

(P) $O_{2} (g)$ (1) $Δ_{f} H^{o} = + ve Δ_{f} S^{o} = + ve$

(Q) $O_{3} (g)$ (2) $Δ_{f} H^{\circ} = - ve Δ_{f} S^{\circ} = - ve$

(R) $Br_{2} (g)$ (3) $Δ_{f} H^{0} = + ve Δ_{f} S^{0} = - ve$

(S) $H_{2} ($ ℓ $)$ (4) $Δ_{f} H^{\circ} = 0 Δ_{f} S^{\circ} = 0$

Code :

P Q R S

Answer:

Solution:

Element in standard state → 0, Gas formation → +ΔH, +ΔS, Gas from less stable molecule → +ΔH, –ΔS, Liquid → –ΔS

Stream:JEESubject:ChemistryTopic:ThermochemistrySubtopic:Enthalpy of Formation

⏱ 2mℹ️ Source: QB

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