Per NCERT, why does a TRUE SOLUTION (like salt water) NOT show the Tyndall effect — while milk does?
ATrue solutions contain no particles at all
BTrue solutions absorb all light
CTrue-solution particles are too small to scatter light; colloidal particles in milk are large enough to scatter the laser beam
DTrue solutions are denser than colloids
Answer & Solution
Correct answer: C. True-solution particles are too small to scatter light; colloidal particles in milk are large enough to scatter the laser beam
Per NCERT Activity 5.1, particle size determines Tyndall effect — true solutions (ions/molecules) are below the scattering threshold; colloids scatter light.
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