Q.21 A) Why path of light is not visible in a solution when a beam of light is passed through it? B) Classify each of following as solution, colloid or suspension : i) A mixture whose particles are big enough to scatter a beam of light passing through it, ii) A mixture whose particles settle down when it is left undisturbed.
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The path of light is not visible in a solution as the particles of the solution are too small to scatter a beam of light and hence the path is not visible. An example of a solution is salt when mixed with water.
A solution is a mixture whose particles are too small to scatter a beam of light passing through it. A colloid is a mixture whose particles are big enough to scatter a beam of light and these are stable solutions as their particles do not settle down when left undisturbed. A suspension is a mixture whose particles scatter a beam of light but do not scatter anymore when its particles settle down when left undisturbed and hence are unstable solutions
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