Match each reaction in Column I with the correct relation between Δ H and Δ E in Column II (count gaseous species only): Column I (Reaction) Column II (Relation) (P) 2 H 2 ( g ) + O 2 ( g ) → 2 H

Question

Match each reaction in Column I with the correct relation between $Δ H$ and $Δ E$ in Column II (count gaseous species only):

Column I (Reaction)	Column II (Relation)
(P) $2 H_{2} (g) + O_{2} (g) \to 2 H_{2} O (l)$	(1) $Δ H = Δ E$
(Q) $CaCO_{3} (s) \to CaO (s) + CO_{2} (g)$	(2) $Δ H = Δ E + RT$
(R) $2 NaHCO_{3} (s) \to Na_{2} CO_{3} (s) + H_{2} O (g) + CO_{2} (g)$	(3) $Δ H = Δ E - 2 RT$
(S) $CH_{4} (g) + 2 O_{2} (g) \to CO_{2} (g) + 2 H_{2} O (l)$	(4) $Δ H = Δ E + 2 RT$
(T) $H_{2} (g) + Cl_{2} (g) \to 2 HCl (g)$	(5) $Δ H = Δ E - 3 RT$

Choose the option with the correct matching:

TestHub · Accepted Answer

Δ H = Δ E + Δ n g ​ RT , where solids and liquids are not counted. (P) Δ n g ​ = 0 − 3 = − 3 : (5). (Q) Δ n g ​ = 1 − 0 = + 1 : (2). (R) Δ n g ​ = 2 − 0 = + 2 : (4). (S) Δ n g ​ = 1 − 3 = − 2 (water is liquid): (3). (T) Δ n g ​ = 2 − 2 = 0 : (1). Correct matching: P→5; Q→2; R→4; S→3; T→1. Answer: (D).

Chemistry - Thermodynamics - I Question with Solution | TestHub

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