90. Consider the following sentences and choose the incorrect one: (a) Cooking causes breakdown of complex molecules of carbohydrates, fats and proteins into smaller molecules.
(b) Rusting is a reddish brown flaky substance that forms on the surface of any substances.
(c) Chemical change is permanent and irreversible change.
(d) Cooking is regarded as a decomposition reaction.
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Answer:
Option C
Explanation:
The term Rust can only be used for metals and not all substances.
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