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Q.

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

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a

Br2g

b

Cl2g

c

C(diamond)

d

H2Ol

answer is B.

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Detailed Solution

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Enthalpies of all elements in their standard state is arbitrary taken as zero. Standard state for bromine is liquid and that of carbon is graphite

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