67. Combustion of a candle is a/an A.Photochemical reaction B.Physical change C.Endothermic reaction D.Exothermic reaction
Answer: Option D Solution: In theory, a candle is made of a solid hydrocarbon called paraffin. When the solid burns, the hydrocarbon reacts with oxygen to form carbon dioxide and water. The reaction is exothermic, meaning it releases heat to the atmosphere along with the other products.
