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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

`Br_(2(g))`

B

`Cl_(2(g))`

C

`H_(2)O_((g))`

D

`CH_(4(g))`

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Verified by Experts

The correct Answer is:
b
`Cl_(2(g))` is considered as standard state of `Cl_(2)` and by assumption standard molar enthalpy of formation in standard state is taken as zero.
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