Question

Which among the following are exothermic or endothermic in nature?
1. decomposition of ferrous sulphate
2. Dilution of sulphuric acid
3. Dissolution ( dissolving ) of sodium hydroxide in water

Answer 1

Answer:

Explanation:

answer :

(a) endothermic reaction

explanation : To decompose ferrous sulphate , heat is required to decompose the compound into its components. hence, it is an endothermic reaction

(b) exothermic reaction

explanation : sulphuric acid is one of the strongest acid. so, when we dilute the sulphuric acid, it evolves huge amount of heat. hence, dilution of sulphuric acid is an exothermic reaction.

(c) exothermic reaction

explanation : sodium hydroxide is one of the strongest base. so,when we add the NaOH into water, huge amount of heat evolves. hence, dissolution of sodium hydroxide is an exothermic reaction.

(d) endothermic reaction

explanation : amonium chloride is very weak acid. obviously it is soluble in water but heat is absorbed during dissolution in water. hence, dissolution of amonium chloride is an endothermic reaction.

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Answer 2

1. Decomposition of ferrous sulphate is an endothermic reaction because heat is absorbed during the reaction.

2. The process of dissolving sulphuric acid in water i.e., dilution of sulphuric acid) is a highly exothermic reaction.

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