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Question

Which of the following is a characteristic of an exothermic reaction?

This question was previously asked in
SSC CGL 2017 (Tier 1) Previous Year Paper (16-Aug-2017) (Shift 1)
The correct answer is

Release of heat

An exothermic reaction is one in which the products have lower energy than the reactants, so the excess energy is given out to the surroundings, mainly as heat (sometimes also light or sound). The enthalpy change is therefore negative, \(\Delta H < 0\), and the temperature of the surroundings rises.

Common examples include combustion of fuels, neutralisation of acids by bases, and respiration. Absorption of heat describes an endothermic reaction, while a reaction with no temperature change would be neither.

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