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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_2O(g)`

D

`CH_(4)(g)`

Text Solution

Verified by Experts

The correct Answer is:
B
`DeltaH_(f) "of" Br_(2(l)) = 0 " " Br_(2) (g) != 0`
`Delta H_(f) "of" Cl_(2) (g) = 0`.
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