23. Assertion and reasoning for types changes around us

Exercise condition:

6 m.

Examine the two statements carefully and decide if the given options are correct:

1. Assertion (A): Burning of wood is a physical change.
Reason (R): The products such as ash and smoke formed on burning of wood cannot be converted to wood.

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

2. Assertion (A): Decaying of food is a chemical change.
Reason (R): Decaying of food is not a permanent change.

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

3. Assertion (A): A very hot glass shown under cold water got cracked due to expansion of the glass surface.
Reason (R): A very hot glass shown under cold water got cracked due to contraction of the glass surface.

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

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