Which of the changes involve evolution of heat ?
Burning of fuels
Cooking of food
Digestion
Curdling
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Answer:
These reactions are accompanied with evolution of heat. Melting of solids, fusion, evaporation and vaporisation are examples of endothermic reaction. Combustion of petrol and oxidation of ammonia are examples of exothermic reaction.
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Answer:
A.Burning of fuel.
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