7. Find out the mismatched pair among the following.
a. Desirable change: Destruction caused by floods
b. Undesirable change: Pollution caused by floods
c. Exothermic reaction: Reaction between water and quick lime
d. Endothermic reaction: Melting of ice cubes
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a) desirable change: Destruction caused by floods
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a desirable change :- destruction caused by floods
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