Question

Which of the following is a part of inorganic impurities of the sewage?

• A. Pesticides
• B. Urea
• C. Phosphates
• D. Vegetable waste

Answer 1

The correct option is C

Phosphates

The correct option is C

Explanation of the correct option:

1. Inorganic impurities include phosphates, nitrates, and metals.
2. Phosphate is considered an inorganic impurity in sewage.
3. These impurities are removed by using bacteria.

Explanation of the incorrect option:

Option A:

1. Pesticides are used to control pests in the field.
2. Only organic pesticides are found in sewage.

Option B:

Urea is an example of nitrogenous fertilizer.

Option D:

1. Vegetable waste is totally organic material found in the sewage.
2. Therefore it is not considered inorganic impurities.

Final answer: Phosphate is a part of the inorganic impurities of sewage.