The species which by definition has ZERO standard Molar enthalpy of formation at 298 k is

Br₂

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Cl₂(g)

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H₂O(g)

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CH₄(g)

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Solution

The correct option is B
Cl₂(g)

$Δ H_{f}^{0}$ is generally zero for elements, and in standard conditions Bromine is in liquid state while chlorine is in Gaseous state

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