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Which among the following changes are ex...

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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Decomposition of ferrous sulphate and dissolution of ammonium chloride in water are endothermic reactions as heat is absorbed in these changes. Dilution of sulphuric acid and dissolution of sodium hydroxide in water are exothermic reactions as heat is released in these changes.
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