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Suman Kumar Best Answer
option B is correct. The standard enthalpy of formation or standard heat of formation of a compound is the change of enthalpy during the formation of 1 mole of the substance from its constituent elements, with all substances in their standard states.
C(graphite) should be there for ist reaction & for 3rd 1 mole of NH3 should be formed. for 4th CO is not a element
why c is the wrong answer?
did you get this ?
tqq 😇