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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`

D

`CH_(4)(g)`

Text Solution

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The correct Answer is:
B
`DeltaH_(f)^(@)` of elements in their standard state is taken to be zero. `Cl_2` is gas, `Br_2` is liquid and `I_2` is solid at room temperature.
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