Impurities of water are

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(D) Water impurities are classified based on their physical state and size.$1$. Suspended solids: These are particles that do not dissolve and can be

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All of the above

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(D) Water impurities are classified based on their physical state and size.$1$. Suspended solids: These are particles that do not dissolve and can be removed by filtration.$2$. Colloidal material: These are fine particles that remain suspended in water and are difficult to remove by simple filtration.$3$. Dissolved materials: These include salts,minerals,and gases that are completely dissolved in water.Since all three categories represent common forms of water pollution/impurities,the correct answer is $D$.

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