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Which of the following reactions do(es)n...

Which of the following reactions do(es)n't represent the standard state enthalpy of formation reaction?

A

`1/2 H_2(g)+1/2 Cl_2(g)rarrHCl(g)`

B

`CO(g)+1/2 O_2(g)rarrCO_2(g)`

C

`N_2(g)+1/2 O_2(g)rarrN_2O(g)`

D

`Na^+ (g)+Cl^- "(aq) rarr NaCl(s)`

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(2),(4)
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