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In which of the following reactions, `DeltaH gt DeltaU`?

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In which of the following reactions, `DeltaH gt DeltaU`?
A. `2HI(g) rarr H_(2)(g) + I_(2)(g)`
B. `2NO_(2)(g) rarrN_(2)O_(4)(g)`
C. `N_(2)(g)+3H_(2)(g) rarr 2NH_(3)(g)`
D. `2SO_(2)(g) + O_(2)(g) rarr 2SO_(3)(g)`
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Correct Answer - A
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