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CHEMISTRY

JAMB 2001 - Question 31

Chemistry 2001 JAMB Past Questions - Question 31: When ΔH is negative, a reaction is said to be

Choose the correct answers from the options given.

When ΔH is negative, a reaction is said to be

A: ionic

B: reversible

C: exothermic

D: endothermic

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Correct Answer

Explanation

When ΔH (change in enthalpy) is negative, a reaction is said to be exothermic. An exothermic reaction releases heat to its surroundings. In such reactions, the products have lower enthalpy than the reactants, and the excess energy is released in the form of heat. Combustion reactions, such as the burning of fuels, are common examples of exothermic reactions.