A. Combustion of Methane
B. Decomposition of Water
C. Dehydrogenation of ethane or ethylene
D. Conversion of graphite to diamond
Correct Answer: A. Combustion of Methane
Detail about MCQs
The combustion of methane is an exothermic reaction, not an endothermic one. In an exothermic reaction, heat is released to the surroundings as a product of the reaction. When methane (CH4) burns in the presence of oxygen (O2) to produce carbon dioxide (CO2) and water (H2O), it releases heat energy, making it an exothermic process.
The other options (B, C, and D) involve reactions that require the input of energy to proceed, making them endothermic reactions: