1.

For which of the following reactions would the Ho for the reaction be labeled Delta H_(f)^(0) ?

Answer»

`AL (s) + 3//2H_(2) (g) + 3//2 O_(2) (g) rarr Al(OH)_(3) (s)`
`PCl_(3) (g) + 1//2O_(2) (g) rarr POCl_(3) (g)`
`1//2N_(2) O (g) + 1//4O_(2) (g) rarr NO (g)`
`CaO(s) + SO_(2) (g) rarr CaSO_(3) (s)`

Answer :A


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