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  4. Statement 1: Heat of combustion are always exothermic. Statement 2: Combustion of N 2 to give NO is exothermic.

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Q. Statement 1: Heat of combustion are always exothermic.
Statement 2: Combustion of $N _2$ to give $NO$ is exothermic.

Thermodynamics

Solution:

$1 / 2 N _2+1 / 2 O _2 \rightarrow NO ; \Delta H=+$ ve. It is due to high bond energy of $N_2$. Note this equation does not represent heat of combustion of $N _2$ (partial combustion).