Question

(A) Both A and R are true but R is not the correct explanation of A

(B) Both A and R are true and R is the correct explanation of A

(C) A is true but R is false

(D) A is false but R is true

1. Assertion (A): Bursting a firecracker is a physical change.

Reason (R): A physical change can be a reversible change.

2. Assertion (A): Decaying of food is a chemical change.

Reason (R): Decaying of food is not a permanent change.

3. Assertion (A): There is a small gap left between the rails of a railway track.

Reason (R): Cooling of substances result in contraction.

Answer 1

Answer:

2. C) A is true but R is false

1. Bursting a firecracker is both a chemical and physical change., so iam not sure on this .but R is a true statement

3.IDK

plz mark brainliest

Answer 2

1. (D) A is false but R is true 2. (C) A is true but R is false 3. (A) Both A and R are true but R is not the correct explanation of A

• The bursting of firecrackers is a chemical change. It is a chemical change because there is a formation of a new substance that is completely different from the original form. Physical changes are reversible changes because no new substances are formed chemically so, they can be reversed. Hence, A is false but R is true.
• Decaying food is a chemical change because the original form is transformed into decay. This is a permanent chemical change as a new substance is formed. Hence, A is true but R is false.
• There is a small gap left between the rails of a railway track because, during summers, they expand while in the contract in winter. Cooling of substances results in contraction. Hence, both A and R are true but R is not the correct explanation of A.