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For which of the following reaction, \( \Delta \mathrm{H}_{\text {reaction }}^{\mathrm{o}} \) is not equal to \( \Delta \mathrm{H}_{\mathrm{f}}^{\mathrm{o}} \) of product?
(a) \( 2 \mathrm{CO}(\mathrm{g})+\mathrm{O}_{2}(\mathrm{~g}) \longrightarrow 2 \mathrm{CO}_{2}(\mathrm{~g}) \)
(b) \( \mathrm{N}_{2}(\mathrm{~g})+\mathrm{O}_{3}(\mathrm{~g}) \longrightarrow \mathrm{N}_{2} \mathrm{O}_{3}(\mathrm{~g}) \)
(c) \( \mathrm{CH}_{4}(\mathrm{~g})+2 \mathrm{Cl}_{2}(\mathrm{~g}) \longrightarrow \mathrm{CH}_{2} \mathrm{Cl}_{2}(\ell)+2 \mathrm{HCl}(\mathrm{g}) \)
(d) \( \mathrm{Xe}(\mathrm{g})+2 \mathrm{~F}_{2}(\mathrm{~g}) \longrightarrow \mathrm{XeF}_{4}(\mathrm{~g}) \)
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