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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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(a) Endothermic (b) Exothermic (c) Exothermic (d) Endothermic.
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