Answer: Option (b) is the correct answer.
Explanation:
Enthalpy is defined as the exchange of heat in chemical reactions. Enathlpy is denoted by [tex]\Delta H[/tex].
When [tex]\Delta H[/tex] is positive then it means the reaction is endothermic whereas if [tex]\Delta H[/tex] is negative then it means the reaction is exothermic.
Whereas kinetic energy is the energy obtained due to motion of atoms. When we increase temperature then generally atoms gain kinetic energy.
Temperature is the measure of thermal energy of a reaction. On the other hand, physical properties are the properties that does not change the chemical composition of a substance.
Therefore, we can conclude that the heat exchange in chemical reactions is due to a change in enthalpy.
