Solutions do not exhibit the Tyndall effect. The particles in solutions are larger than 100 nm. Class 9

Solutions do not exhibit the Tyndall effect. The particles in solutions are larger than 100 nm. Class 9

Question 1.

Assertion (A): Solutions do not exhibit the Tyndall effect.

Reason (R): The particles in solutions are larger than 100 nm, so they cannot scatter light.

Choose the correct option:

(i) Both A and R are true, and R is the correct explanation of A.

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

(iii) A is true, but R is false.

(iv) A is false, but R is true.

Answer:

Option (iii) A is true, but R is false.

Explanation: The assertion is true - solutions do not show the Tyndall Effect. However, the reason given is false. The particles in a solution are SMALLER than 1 nm (not larger than 100 nm). It is because the particles are so small (less than 1 nm) that they cannot scatter light effectively, so solutions do not show the Tyndall Effect.