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Q.

For which of these is ${ΔH}_{f}^{\circ}$ not equal to zero?

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a

$I_{2} (s)$

b

${Br}_{2} (l)$

c

$O_{3} (g)$

d

$Fe (s)$

answer is D.

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Detailed Solution

For the ozone gas the value of ${ΔH}_{f}^{\circ}$ is not equal to zero.

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For which of these is ΔHf∘ not equal to zero?