Which of the following changes cannot be reversed?

Options

A. Cold milk to hot milk
B. Milk to paneer
C. Water to Ice
D. Wet clothes to dry clothes

Answer

To determine which of the following changes cannot be reversed, we need to analyze each option carefully.

### Step-by-Step Solution:

1. **Understanding Reversible Changes:**
- A reversible change is one where the original substance can be recovered after the change has occurred.

2. **Analyzing the Options:**
- **Option 1: Cold milk to hot milk**
- When cold milk is heated, it becomes hot milk. If we leave hot milk to cool down, it will return to cold milk.
- **Conclusion:** This change is reversible.

- **Option 2: Milk to paneer**
- Milk is heated and then curdled using acidic ingredients to make paneer. Once milk is converted to paneer, it cannot be turned back into milk.
- **Conclusion:** This change is not reversible.

- **Option 3: Water to ice**
- Water can be frozen to form ice. When ice is melted, it turns back into water.
- **Conclusion:** This change is reversible.

- **Option 4: Wet clothes to dry clothes**
- Wet clothes can be dried by placing them in sunlight. If we pour water on dry clothes, they become wet again.
- **Conclusion:** This change is reversible.

3. **Final Answer:**
- The change that cannot be reversed is **Milk to paneer**.