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Question

Which among the following changes are exothermic or endothermic in nature?

(a) Decomposition of ferrous sulphate

(b) Dilution of sulphuric acid

(c) Dissolution of sodium hydroxide in water

(d) Dissolution of ammonium chloride in water


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Solution

A chemical reaction that includes the release of energy in the form of heat or light is known as an exothermic reaction. Endothermic reactions are chemical reactions in which the reactants absorb heat energy from the surroundings to form products.

(b) and (c) are exothermic as heat is released in these processes. (a) and (d) are endothermic as heat is absorbed in these processes.


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