Which of the following is a characteristic difference between colloids and true solutions?
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A.
True solutions have visible solute particles, whereas colloids have invisible dispersed particles.
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B.
True solutions exhibit Brownian motion, but colloids do not.
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C.
True solutions show the Tyndall effect, but colloids do not.
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D.
True solutions have a single-phase system, whereas colloids have a two-phase system.
Correct Answer:
D. True solutions have a single-phase system, whereas colloids have a two-phase system.
Explanation:
Colloids and true solutions are distinguished by their internal structure and phase composition. A true solution is a homogeneous, single-phase system where the solute is completely dissolved in the solvent at a molecular or ionic level, making the particles invisible and inseparable. In contrast, a colloid is a heterogeneous, two-phase system consisting of a dispersed phase and a continuous dispersion medium. The particles in a colloid are larger than those in a true solution but smaller than those in a suspension, resulting in distinct physical properties like the Tyndall effect and Brownian motion. Therefore, the primary characteristic difference is that true solutions are single-phase systems while colloids are two-phase systems.
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