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Which of the following is an exothermic ...

Which of the following is an exothermic reaction?

A

Conversion of graphite to diamond

B

Dehydrogenation of ethane to ethylene

C

Combustion of methane

D

Decomposition of water

Text Solution

Verified by Experts

The correct Answer is:
C
Any process that gives off heat (that is, transfer thermal energy to surrounding) is called an exothermic process. Exo comes from Greek word meaning outside. Combustion is one of the many chemical reaction that release considerable quanitties of energy. In constrast, in an endothermic process, heat has to be supplied to the system by the surrounding. Endo comes from the Greek workk meaning inside.
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