When four dilute solutons of (1) vinegar, (II) common salt, (III) caustic soda and (IV) baking soda are tested with universal indicator which will be the correct observation.

Options

A. I- Green, II- Violet, III- Blue, IV-Red
B. I- Green, II- Blue, Ill-Violet, IV-Red
C. I- Red, II- Green, III- Violet, IV- Blue
D. I- Red, II- Violet, III- Green, IV- Blue

Explanation

To determine the correct observations when testing the four dilute solutions (vinegar, common salt, caustic soda, and baking soda) with a universal indicator, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Nature of Each Solution**:
- **Vinegar**: This is an acidic solution (acetic acid).
- **Common Salt (Sodium Chloride)**: This is a neutral solution.
- **Caustic Soda (Sodium Hydroxide)**: This is a basic (alkaline) solution.
- **Baking Soda (Sodium Bicarbonate)**: This is also a basic (alkaline) solution.

2. **Understanding Universal Indicator**:
- A universal indicator is a pH indicator that changes color based on the acidity or alkalinity of the solution.
- It typically shows red or orange for acidic solutions, green for neutral solutions, and blue or purple for basic solutions.

3. **Testing Each Solution**:
- **Vinegar**: When tested with the universal indicator, it will turn red or orange, indicating it is acidic.
- **Common Salt**: When tested, it will show green, indicating it is neutral.
- **Caustic Soda**: When tested, it will turn blue or purple, indicating it is basic.
- **Baking Soda**: When tested, it will also turn blue or purple, indicating it is basic.

4. **Summarizing the Observations**:
- **Vinegar**: Red/Orange (Acidic)
- **Common Salt**: Green (Neutral)
- **Caustic Soda**: Blue/Purple (Basic)
- **Baking Soda**: Blue/Purple (Basic)

### Final Observations:
- **Vinegar**: Acidic (Red/Orange)
- **Common Salt**: Neutral (Green)
- **Caustic Soda**: Basic (Blue/Purple)
- **Baking Soda**: Basic (Blue/Purple)