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Q.

Which one of the following correctly represents a thermochemical equation

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a

C(graphite)+O2(g)→CO2, ΔH=−393 kJ

b

H2(g)+12O2(g)→H2O(l),   ΔH=−286 kJ

c

All of these

d

N2+O2→2NO,   ΔH=+180 kJ

answer is C.

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Detailed Solution

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In 1st option-physical states are not mentioned for all the species.

In 2nd option-physical state is not mentioned for CO2.

In 3rd option-physical state are mentioned and also enthalpy value is mentioned with proper units. So, the correct option is (c).

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