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Choose the reactions in which the standa...

Choose the reactions in which the standard reaction enthalpy (at `25^(@)C`) represent the standard formation enthalpy of the product-

A

`H_(2)(g)+(1)/(3) O_(3)(g)toH_(2)O(l)`

B

`Na(s)+(1)/(2)Cl_(2)(g)toNaCl(s)`

C

`CO(g)+(1)/(2)O_(2)(g)toCO_(2)(g)`

D

`(1)/(2)H_(2)(g)+(1)/(2)I_(2)(g)toHI(g)`

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The correct Answer is:
B, D
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