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Which amongst the following changes are exothermic or endothermic in nature.

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Which amongst the following changes are exothermic or endothermic in nature?
i. Decomposition of ferrous sulphate
ii. Dilution of sulphuric acid
iii. Dissolution of sodium hydroxide in water
iv. Dissolution of ammonium chloride in water.
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i. Endothermic

ii. Exothermic
iii. Exothermic 

iv. Endothermic

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