Which of the following is an examples of an exothermic reaction?

Dissolving ammonium chloride in water

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Evaporating liquid water

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Melting of ice

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Respiration

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Solution

The correct option is D Respiration
Exothermic reactions give off heat when the reaction happens. If this happens in a solution, it usually makes the solution mixture warm.
When ammonium chloride is dissovled in water, it gets cold. Water absorbs heat to evaporate, melting of ice requires a heat input too - all of these are endothermic reactions.
Respiration produces heat - this is an exothermic process.

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