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Question

In the exothermic reaction, the enthalpy of reaction is always

A
zero
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B
positive
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C
negative
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D
None of these
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Solution

The correct option is A negative
Exothermic and endothermic reactions cause energy level differences and therefore differences in enthalpy (ΔH), the sum of all potential and kinetic energies. ΔH is determined by the system, not the surrounding environment in a reaction. A system that releases heat to the surroundings, an exothermic reaction, has a negative ΔH by convention, because the enthalpy of the products is lower than the enthalpy of the reactants of the system.

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