1.

For which one of the following equations is Delta_(r) H^(theta) equal to Delta_(f)H^(theta) for the product ?

Answer»

`N_(2)(G) + O_(3)(g) RARR N_(2)O_(3)(g)`
`CH_(4)(g) + 2Cl_(2)(g) rarr CH_(2)Cl_(2)(g) + 2HCl(g)`
`Xe(g) + 2F_(2)(g) rarr XeF_(4)(g)`
`2CO(g) + O_(2) rarr 2CO_(2)(g)`

Answer :C


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