For which of the following standard enthalpy of formation is zero?

B r_{2 (g)}

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H B r_{(g)}

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C l_{2 (g)}

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C_{g r a p h i t e}

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Solution

The correct options are
A $B r_{2 (g)}$
C $C l_{2 (g)}$
D $C_{g r a p h i t e}$
Graphite , $C l_{2 (g)}, B r_{2 (g)}$ have $Δ H_{f}^{0} = 0$
HBr is not an element

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