Water in wells can be purified by adding:

washing soda

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sodium chloride

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calcium

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alum

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Solution

The correct option is C alum
Water in wells can be purified by adding Alum to it.
Alum clarifies water by neutralizing the electrical double layer surrounding very fine suspended particles, so that they flocculate (stick together). After flocculation, the particles become large enough to settle and can be removed.
Alum is the hydrated potassium aluminium sulfate (potassium alum) with the formula $K A l (S O_{4})_{2} \cdot 12 H_{2} O$ .

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