We have to shake cough syrup before using because it is a ___________.

suspension

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colloid

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pure substance

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solution

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Solution

The correct option is A suspension
A suspension is a heterogeneous mixture in which the solids particles do not dissolve in the liquid completely. The undissolved particles can be observed by naked eyes.
Cough syrup is a suspension because the drug particles are not fully dissolved in the solvent. The solute particles in the cough syrup settle down when it is kept undisturbed. Therefore, we shake the syrup before consuming it.

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