1.

Are all chemical changes desirable changes ? Justify with at least five example.

Answer» All chemical changes are not dersirable
Examples
(1) Rusting of iron.
(2) Spoilage of food.
(3) Coagulation of milk
(4) Blackening of silverware
(5) Rancidification of oils
These changes are not dersirable chemical changes as they result in wastage of resources.


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