Energy is ________ when nitrogen is combined with oxygen to form NO.

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Solution

When nitrogen is combined with oxygen to form NO some amount of energy is released during the formation of bonds between nitrogen and oxygen.
In this case the energy absorbed is more than the energy released. Hence it is an endothermic reaction.
$N_{2} (g) + O_{2} (g) \to 2 NO (g) - 44 kcal$
Therefore energy is absorbed when nitrogen is combined with oxygen to form NO.

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