The given diagram shows the energy levels of the reactants and products for a particular reaction:

Which of the following processes can be related to the given diagram?

Options

A. Ethyne gas burns in oxygen to form carbon dioxide and water along with evolution of heat.
B. When solid mercury (II) oxide is heated liquid mercury and oxygen gas are produced.
C. Hydrogen gas combines with chlorine gas in the presence of light to form hydrogen chloride gas.
D. Potassium chlorate decomposes in presence of heat to form potassium chloride and oxygen.

Answer

A

Explanation

In the given diagram, the energy of reactants is greater than products, thus, energy is released during the reaction i.e., the reaction is exothermic.
Ethyne gas burns in oxygen as:
`underset("Ethyne")(C_(2)H_(2))+underset("Oxygen")(5/2O_(2))tounderset("dioxide")underset("Carbon")(2CO_(2))+underset("Water")(H_(2)O)+"Heat"`
Whereas, all other given reactions consume heat or light.