A) \[2CO(g)+{{O}_{2}}(g)\,\to \,2C{{O}_{2}}(g)\]
B) \[{{N}_{2}}(g)+{{O}_{3}}(g)\,\to \,{{N}_{2}}{{O}_{3}}(g)\]
C) \[C{{H}_{4}}(g)+2C{{l}_{2}}(g)\,\to \,C{{H}_{2}}C{{l}_{2}}(l)+2HCl(g)\]
D) \[Xe(g)+2{{F}_{2}}(g)\,\to \,Xe{{F}_{4}}(g)\]
Correct Answer: D
Solution :
Both \[{{X}_{e}}\]and \[{{F}_{2}}\]are gaseous elements at \[{{25}^{o}}C\] and in their standard states and form \[Xe{{F}_{4(g)}}\] hence \[\Delta H_{(f)}^{\circ }=\Delta H_{\text{react}}^{\circ }\].
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