Which among the following changes are exother mic orendothermic 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
Question
Which among the following changes are exother mic orendothermic 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
Solution
(a) Decomposition of ferrous sulphate: This is an endothermic process. In an endothermic process, energy is absorbed from the surroundings in the form of heat. The decomposition of ferrous sulphate requires heat to proceed, hence it is endothermic.
(b) Dilution of sulphuric acid: This is an exothermic process. In an exothermic process, energy is released to the surroundings in the form of heat. When sulphuric acid is diluted, it releases heat, hence it is exothermic.
(c) Dissolution of sodium hydroxide in water: This is an exothermic process. When sodium hydroxide dissolves in water, it releases heat, hence it is exothermic.
(d) Dissolution of ammonium chloride in water: This is an endothermic process. When ammonium chloride dissolves in water, it absorbs heat from the surroundings, hence it is endothermic.
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