The amount of oxygen consumed by pollutants in water found by titration with acidified `K_2Cr_2O_7` is called _____ of water.

Answer

To solve the question regarding the amount of oxygen consumed by pollutants in water, we follow these steps:

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for the term that describes the amount of oxygen consumed by pollutants in water, which is determined through a titration process using acidified potassium dichromate (K2Cr2O7).

2. **Identifying the Process**: The titration with acidified K2Cr2O7 is a common analytical method used to measure the amount of oxygen that can be consumed by organic and inorganic substances in a sample of water.

3. **Defining the Term**: The specific term used to describe the amount of oxygen consumed by pollutants in water is known as Chemical Oxygen Demand (COD).

4. **Conclusion**: Therefore, the answer to the question is that the amount of oxygen consumed by pollutants in water found by titration with acidified K2Cr2O7 is called **Chemical Oxygen Demand (COD)**.

### Final Answer:
The amount of oxygen consumed by pollutants in water found by titration with acidified K2Cr2O7 is called **Chemical Oxygen Demand (COD)**.

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