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The species which by definition has zero...

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

A

`Br_(2)`(g)

B

`Cl_(2)`(g)

C

`H_(2)O`(g)

D

`CH_(4)`(g)

Text Solution

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The correct Answer is:
B
`Cl_(2)` is gas at 298 K while `Br_(2)` is a liquid.
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