Which one of the following will NOT show Tyndall effect?

The Tyndall effect is the scattering of light by particles in a colloid or a fine suspension, making the light beam's path visible [2]. It occurs when particle sizes range between 1 to 1000 nanometers [2]. Milk mixed with water is a classic colloid (emulsion) that scatters light [1]. Starch solution is also a well-known colloid that exhibits this effect [1]. Freshly mixed chalk powder in water forms a suspension; while suspensions are coarser, they contain particles large enough to scatter light before settling [2]. In contrast, lime juice is a true solution containing dissolved citric acid and sugars. In true solutions, the solute particles are too small (typically less than 1 nm) to scatter visible light [2]. Therefore, lime juice will not show the Tyndall effect, as the path of light remains invisible through it.

Sources

1. [2] https://en.wikipedia.org/wiki/Tyndall_effect
2. [1] https://scert.cg.gov.in/pdf/textbook-EM-2021-22/Class9%20-%20Science-reduced.pdf