Question

विच वन ऑफ द फॉलोविंग रिअँक्शन्स इज an exothermic reaction 1 डिsसोल्युशन ऑफ पोटॅशियम नायट्रेट विथ वॉटर. 2 दिसोल्युशन ऑफ क्विक लाईन इं वॉटर. 3 मेल्टिंग ऑफ आईस क्यूब 4 डी कंपोझिशन ऑफ कॅल्शियम कार्बोनेट

Answer 1

Answer:

dissolution of quicklime with water.

Explanation:

quicklime also known as calcium carbonate when dissolves in water it forms calcium hydroxide (commercially known as limewater) and releases large amount of heat.

we know that an exothermic reaction is a reaction in which heat is evolved or given out.

the other three reactions are endothermic because we have to supply heat from outside for the reaction to happen.