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

Options

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

Answer

To determine which of the following is a part of inorganic impurities of sewage, we need to analyze each option provided:

1. **Understanding Sewage**: Sewage is a complex mixture that includes water, dissolved and suspended solids, organic and inorganic impurities, nutrients, and disease-causing bacteria. Inorganic impurities typically include substances like nitrates, phosphates, and metals.

2. **Analyzing the Options**:
- **Option A: Pesticides** - Pesticides are chemicals used to kill pests and are considered organic impurities.
- **Option B: Urea** - Urea is a nitrogen-containing compound that is also classified as an organic impurity.
- **Option C: Phosphates** - Phosphates are inorganic compounds that are commonly found in sewage and are considered inorganic impurities.
- **Option D: Vegetative Waste** - This refers to plant material and is classified as organic waste.

3. **Conclusion**: Based on the analysis, the only option that is classified as an inorganic impurity is **Option C: Phosphates**.

### Final Answer:
The part of inorganic impurities of the sewage is **Option C: Phosphates**.