Question

A true solution is a homogenous mixture of solute and solvent. Chalk powder in water is a heterogeneous mixture. Hence chalk powder is not a true solution.
(A) True
(B) False

Answer 1

Hint: In a true solution, the solute is completely mixed with the solvent and has a uniform composition throughout its solution and when chalk powder is dissolved in water, it doesn’t get completely soluble in the solvent and has non- uniform composition throughout the solution. now, identify the answer.,

Complete step by step solution:
First of all, we should know what is a true solution. By the true solution, we mean a homogenous solution ( i.e. that solution which has uniform composition and properties throughout the solution) which consists of small solute particles(molecules or ions) dispersed in the solvent. Example: solution of sugar in water.
In this true solution, the particles of the solute are completely mixed with the water and are invisible in the solution and have particles of less than 1 nanometer. It has a uniform composition throughout the solution and hence, thus cannot be separated from physical methods such as filtration or ordinary -filtration.
In case of the chalk powder, the particles of chalk powder are neither completely dissolved in the water nor uniformly distributed in the water and can be separated by the method of filtration. So, hence the chalk powder in water is not a true solution.

Thus, option (A) is correct.

Note: true solutions don’t show the Tyndall effect i.e. there is no scattering of the light by the particles due to which its path becomes visible and the Brownian effect i.e. the particles do not show continuous zig-zag motion).