You are here
Question
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.
Show answer
Answer
Option
(iii)
— A is true, but R is false.
Explanation
- The assertion is true : a solution is transparent and the path of a light beam through it cannot be seen.
- The reason is false for two separate reasons . First, the particles of a solution are smaller than 1 nm , not larger than 100 nm. Second, the logic is back to front — it is large particles that scatter light, not small ones.
Why the other options are wrong
Options (i) and (ii) both treat R as true, and option (iv) treats A as false.
Right conclusion, wrong reasoning — that is exactly what option (iii) describes.
← Back to: 5.5 Tyndall Effect
