The options that will show the Tyndall effect are b. milk and d. starch solution.
Explanation: The Tyndall effect is the scattering of light by particles in a colloid, and milk and starch solutions are considered colloids, meaning their particles are large enough to scatter light beams passing through them.
Key points about the Tyndall effect:
True solutions vs. colloids:
True solutions have very small particles dissolved in the solvent, which are too small to scatter light, while colloids have larger particles that can scatter light.
Examples:
Besides milk and starch, other examples of colloids that show the Tyndall effect include fog and smoke.
Why other options are incorrect:
a. Salt solution:
Salt solutions are considered true solutions, meaning their particles are too small to scatter light.
c. Copper sulphate solution:
Similar to salt solutions, copper sulphate solutions are also true solutions and do not show the Tyndall effect.