Which of the following CANNOT be separated by ordinary filtration?
True solution
Ordinary filtration separates mixtures based on particle size, allowing very small dissolved particles to pass through the filter paper while larger, undissolved particles are retained.
A true solution consists of particles that are dissolved at the molecular or ionic level, so they pass through the filter paper along with the liquid and cannot be separated by filtration.
In contrast, mixtures like sand and water, suspensions, and colloidal solutions contain larger particles that can often be separated using filtration or more advanced techniques.
Hence, the correct answer is a true solution.
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