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Question
Choose the correct options, and explain the reason for the correct and incorrect options.
Which among the following mixtures show the Tyndall Effect? A mixture of:
- (a) air and dust particles
- (b) copper sulfate and water
- (c) starch and water
- (d) acetone and water
(i) a and b (ii) b and d (iii) a and c (iv) c and d
Show answer
Answer
Option
(iii)
—
(a) and (c)
.
Explanation
- (a) Air and dust is a heterogeneous mixture whose particles scatter light — exactly what you see in a beam entering a dark room.
- (c) Starch and water is a colloid, and its particles scatter light too.
Why the others do not
- (b) Copper sulfate and water is a true solution — transparent, with particles below 1 nm, far too small to scatter light.
- (d) Acetone and water is a solution of two miscible liquids, so there is no Tyndall effect there either.
Colloids and suspensions scatter; true solutions do not.
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