In which of the following, heat energy will be evolved? (a) Electrolysis of water (b) Dissolution of NH4Cl in water (c) Burning of L.P.G. (d) Decomposition of AgBr in the presence of sunlight
(3) Burning of L.P.G. Explanation for correct answer Correct answer: (3) Burning of L.P.G Heat of combustion is total amount of heat released when a fuel is completely combusted in the presence of oxygen. It is an exothermic reaction, hence, it releases heat. It is a chemical reaction in which hydrocarbon is burnt, and it produces carbon dioxide, heat and water. Fuels releases heat on burning.
