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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Answer:
(a) Endothermic.
(b) Exothermic.
(c) Exothermic .
(d) Exothermic.
Explanation:
(a) In this case heat is required for the chemical bonds to break hence it is exothermic.
(b) In this case WHENEVER AN ACID IS ADDED TO WATER (or when it ionises), IT ALWAYS RELEASES ENERGY.
(c) Dissolution mostly results to release in energy.
(d) Dissolution mostly results to release in energy.
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