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Which one of the following represents standard enthlpy of formation

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a
H2g+12O2g→ H2Og,ΔH=−245kJ
b
Sβ+O2g→ SO2g,ΔH=+300kJ
c
NOg+12O2g→ NO2g,ΔH=−90kJ
d
12N2g+32H2g→ NH3g,ΔH=−44kJ

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detailed solution

Correct option is D

(1) H2Og... Not a standard state.(2) S8α...  is standard but not S(β) more over ΔH must be -ve(3) ‘NO’ is compound.       ΔoHf must involve only elements on the reactant side

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