Question

2. The following questions consist of two statements-Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below: (a) Both A and R are true and R is the correct explanation of A. (6) Both A and R are true but R is not the correct explanation of A. (c) A is true but R is false. (d) A is false but R is true. (3 x 1 = 3) () Assertion (A) : The particles of a suspension can be seen by naked eye. Reason (R) : When a suspension is left undistributed, it becomes unstable. (a) Assertion (A) : A mixture of salt and camphor is separated by sublimation. Reason (R) : Camphor is sublimable whereas salt is non-sublimable component. (m) Assertion (A) : During a chemical change, no new substance is formed. Reason (R) : Burning a candle involves both physical and chemical changes.​

Answer 1

Answer:

When the suspension is left undisturbed it becomes unstable because the solute particles settle down, they can be separated by the process of filtration. Hence both the assertion and reason are correct but the reason is not the correct explanation of assertion.

Camphor is a sublimable volatile solid, whereas sodium chloride is a non-sublimable solid. ... Therefore, the mixture of camphor and sodium chloride can be separated by the process of sublimation.

a is false and r is true

Answer 2

1. A process where a compound goes from solid-state to the gaseous state without going through the liquid state is kown as sublimation.

So, it can be used to separate a mixture of sublimable substances from non-sublimable substances.

Here, camphor is a sublimable subtance  and salt is a non-sublimable subtance.So, the process of sublimation can be used.

Hence, both A and R are true, and R is the correct explanation of A.

The correct option is (a).

2.  Chemical change involves the conversion of one substance into another.

So, the assertion is false.

Also, during the melting of the candle, both physical as well as chemical change takes place. The melting of wax is a physical change, and the flame's burning is a chemical change.

So, the reason is true.

Hence, the A is false, but R is true.

The correct option is (d).