Identify the set of pure and impure water among the following

Options

A. Rain water, sea water
B. Rain water, distilled water
C. Sea water, river water
D. River water, ground water

Explanation

To solve the question of identifying pure and impure water from the given options, we will follow these steps:

### Step 1: Understand the Definitions
- **Pure Water**: Water that does not contain any impurities, meaning it is free from any dissolved substances or contaminants.
- **Impure Water**: Water that contains impurities, which can be dissolved substances (like salts) or other contaminants.

### Step 2: Analyze Each Option
We have four options to analyze:

1. **Option 1: Rain Water and Sea Water**
- **Rain Water**: Generally considered pure as it forms from condensation and is free from impurities when it falls.
- **Sea Water**: Contains salt and other minerals, making it impure.

2. **Option 2: Rain Water and Distilled Water**
- **Rain Water**: Pure.
- **Distilled Water**: Water that has been boiled and condensed back into liquid, removing impurities, thus it is also pure.

3. **Option 3: Sea Water and River Water**
- **Sea Water**: Impure due to salt content.
- **River Water**: Usually contains various impurities like sediments and microorganisms, making it impure.

4. **Option 4: River Water and Ground Water**
- **River Water**: Impure.
- **Ground Water**: Can be pure or impure depending on the source, but often contains minerals and impurities.

### Step 3: Identify Pure and Impure Sets
From the analysis:
- **Pure Water**: Rain Water, Distilled Water
- **Impure Water**: Sea Water, River Water

### Conclusion
- The correct identification of pure and impure water is:
- **Pure Water**: Rain Water (from Option 1 and 2) and Distilled Water (from Option 2).
- **Impure Water**: Sea Water (from Option 1 and 3) and River Water (from Option 3 and 4).

### Final Answer
- **Option 2: Rain Water and Distilled Water** is the set of pure water.
- **Option 1: Rain Water and Sea Water** is a mix but includes impure water.
- **Option 3: Sea Water and River Water** is a set of impure water.
- **Option 4: River Water and Ground Water** is also a mix but includes impure water.