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Q.

For which of the following reactions, will $Δ H$ be equal to $Δ U$ ?

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a

$H_{2} (g) + \frac{1}{2} O_{2} (g) \to H_{2} O (l)$

b

$H_{2} (g) + I_{2} (g) \to 2 HI (g)$

c

$2 {NO}_{2} (g) \to N_{2} O_{4} (g)$

d

$2 {SO}_{3} (g) \to 2 {SO}_{2} (g) + O_{2} (g)$

answer is B.

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Detailed Solution

$Δ H = Δ U$

only when

$Δ v_{g} = 0$ .

Thus the option B is correct.

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