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Q.

Standard enthalpy of formation is zero for all the following except

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a

$B {r_{2}}_{(l)}$

b

${O_{3}}_{(g)}$

c

$I_{2} (s)$

d

${N_{2}}_{(g)}$

answer is D.

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Detailed Solution

Except O₃ remaining have zero enthalpy of formation (standard elements)

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