Question

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.​

Answer 1

Explanation:

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Answer 2

Option (b) is incorrect

Explanation:

• Option (b) which states that rusting is a reddish brown flaky substance formed on surface of any substance is false.
• Rusting occurs mostly on materials made of iron. When an iron object is exposed to moisture for some time, it gets coated with a reddish- brown flaky substance known as rust. This process is called rusting of iron.
• Rusting of iron involves chemical change and a new substance called iron oxide is formed.
• Therefore rusting does not occur on any surface. The surface needs to be made of iron for the reaction to occur and a reddish brown coating to be formed.