Which of the following is not a physical impurity present in sewage?

Banana peels

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Batteries

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Tissue rolls

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Calcium

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Solution

The correct option is D Calcium

Physical impurities present in sewage are suspended impurities that do not dissolve in water and remain suspended or visible in sewage.

Tissue rolls, batteries and banana peel are examples of physical impurities present in sewage.

Calcium is a chemical impurity that can be categorised as dissolved impurity since it dissolves in water and is not visible in sewage.

Hence, calcium is not a physical impurity present in sewage.

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