In which of the following, heat energy will be evolved?

Burning of L.P.G.

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Dissolution of

N H_{4} C l

in water

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Electrolysis of water

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Decomposition of AgBr in the presence of sunlight

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Solution

The correct option is A Burning of L.P.G.
Burning of L.P.G. is a chemical reaction in which hydrocarbon is burnt, and it produces carbon dioxide, heat and water. While Electrolysis of water, Dissolution of ${NH}_{4} Cl$ in water and Decomposition of AgBr absorbs heat. There is no release of heat during these reactions.

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