RRB ALP CBT I 26 Nov 2024 Shift 2 Paper

Concept:A true solution contains particles of molecular size, which are extremely small.Explanation:In a true solution, the solute particles are molecules or ions.Their diameter is less than $1\ \text{nm}$.These particles are invisible to the naked eye and do not scatter light.They remain uniformly distributed and do not settle down.Such a solution is clear and stable, and filtration cannot separate the solute from the solvent.For comparison, colloidal particles range from $1\ \text{nm}$ to $1000\ \text{nm}$, while suspension particles are larger than $1000\ \text{nm}$.Thus, the particle size of a solution is smaller than $1\ \text{nm}$ in diameter.Answer:Option A: smaller than $1\ \text{nm}$ in diameter.