7.
Give reason for the following.
a.
Dissolution of quicklime in water is an exothermic reaction.
b.
Dissolution of ammonium chloride in water is an endothermic reaction.
C.
Displacement reaction is not possible when iron is kept in contact with solid copper
sulphate.
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Explanation:
1 . quicklime reacts with water to make slaked lime, in this process large amount of heat is produced
2 . In this reaction heat is used up by the ammonium chloride so this reaction is endothermic.
3. Because there is change of ions in displacement reaction which is not possible in open air we require a medium through which charges can pass like an electrolyte displacement does not take place .
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