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What is the typical size range of colloidal particles?

1. Less than 0.1 μ
2. From 1 μ to 0.2 μ
3. Less than 1 μ
4. Greater than 10 μm

Correct answer: Less than 0.1 μ

Solution

Colloidal particles typically have sizes in the range of about 1 nm to 1000 nm, i.e. up to 1 μm. In many exam contexts, they are taken as less than 0.1 μm for a simplified classification.

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