dissolving NH4CL is an endothermic change. but dissolving quick lime in water is an exothermic change. Why?
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Chemical reaction · CO2 + Ca(OH)2 → CaCO3 + H2O + heat (in the presence of water) · 1) CO 2(g) → CO2(aq) (CO2 dissolves in water – slow ...
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When water reacts with quick lime, calcium hydroxide is formed along with release of heat. Thus, it is an exothermic reaction. The process of diluting a concentrated acid is a highly exothermic process. Evaporation of water and sublimation of camphor are examples of endothermic reactions.
Here (i) Reaction of water with quicklime and (ii) Dilution of an acid are the exothermic reaction.
CaO+H
2
O⟶Ca(OH)
2
+Heat
H
2
SO
4
+H
2
O⟶H
3
O
+
+HSO
4
−
+Heat
hope it will help you
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