1.

For which of the following reactions, Delta H is equal to Delta U ?

Answer»

`N_(2)(g) + 3 H_(2)(g) RARR 2 NH_(3)(g)`
`PCl_(5)(g) rarr PCl_(3)(g) + Cl_(2)(g)`
`2 H_(2)S(g) + 3 O_(2)(g) rarr 2 H_(2)O(L) + 2 SO_(2)(g)`
`C(s) + O_(2)(g) rarr CO_(2)(g)`.

Answer :D


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