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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.
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.
View Answer
The correct option is (iii) A is true, but R is false.
The assertion is true — solutions do not show the Tyndall effect. But the reason is false: solution particles are very small (less than 1 nm), not larger than 100 nm. They are too small to scatter light, which is the real reason solutions show no Tyndall effect.
Assertion (A)
Reason (R)
Solutions do not exhibit the Tyndall effect
The particles in solutions are larger than 100 nm
TRUE
— solute particles are far too small to scatter light
FALSE
— solution particles are
less than 1 nm
, not larger than 100 nm
The real reason: the particles are too
small
to scatter light
⇒ correct option is
(iii) A is true, but R is false
