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Is combination reaction are always exothermic reaction ?
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Is combination reaction are always exothermic reaction ?
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Is combination reaction are always exothermic reaction ?
No, they can be endothermic also.

The high-temperature combination of nitrogen and oxygen to form nitric oxide (NO) is an endothermic reaction.

N2 + O2 = 2NO - 180.6 kJ
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Is combination reaction are always exothermic reaction ?
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