52. Which one of the following, on adding to water, will not scatter a beam of light? (a) Copper sulphate (b) Chalk powder (c) Milk (d) Ink
Answers
which one of the following on adding to water, will not scatter a beam of light ?
(a) copper sulphate (b) chalk powder (c) milk ( d) ink
answer : option (a) copper sulphate
explanation : scattering of a beam of light in a solution is known as Tyndall effect. light scatters in colloidal solution. here chalk powder, milk and ink are colloidal solutions so they shows the Tyndall effect. means, they scatter the beam of light. on the other hand, copper sulphate doesn't show Tyndall effect because copper sulphate is a pure substance ( a chemical compound is always considered as pure substance.) and size of particles of pure substance are too small to scatter a beam of light.
Therefore copper sulphate solution will not scatter a beam of light.