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The species which by definition has zero...

The species which by definition has zero standard molar enthalpy of formation at `298K` is

A

`CO_(2)(g)`

B

`H_(2)O(l) `

C

`O_(2)(g)`

D

`P_(4)("red")`

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The correct Answer is:
C
`O_(2)` is present in its standard state.
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