In which of the following mixtures can the particles be seen with the naked eye?
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → Suspension
Mixtures are told apart by the size of their particles. In a suspension, such as muddy water or chalk in water, the particles are large enough to be seen with the naked eye and they settle down when the mixture is left to stand.
Why the other options are incorrect
Option (1) True solution — Incorrect. In a solution such as salt in water the particles are smaller than 1 nm and cannot be seen even under a microscope.
Option (3) Colloidal solution — Incorrect. Colloid particles, as in milk, are too small to be seen with the naked eye, though they scatter a beam of light.
Option (4) All of these — Incorrect. Only in a suspension are the particles visible.