Identify the inorganic impurities in sewage from the following.

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Human feces

Nitrates and phosphates

Bacteria

Animal waste

answer is A.

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Detailed Solution

Sewage contains all impurities like organic substances, inorganic substances, nutrients, microbes, etc.

Inorganic wastes are chemical substances of mineral origin; whereas, organic wastes are chemical substances usually of animal or plant origin.

Inorganic impurity includes nitrates and phosphates released by chemical fertilizers in the soil as they collect in water bodies as agricultural runoffs.

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