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Question
Chemistry
Which of the following is not an endothermic reaction?
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Q. Which of the following is not an endothermic reaction?
Hydrocarbons
A
Combustion of propane
0%
B
Ethane to ethene
33%
C
Dehydrogenation
0%
D
Change of chlorine molecule into chlorine atoms
67%
Solution:
The enthalpy of combustion, i.e., $\Delta H$ is always negative. It means combustion is an exothermic reaction.