One of the following is not a chemical change. This one is

Options

A. ripening of bananas
B. souring of milk
C. decaying of jute bag
D. drying of cotton cloth

Answer

To determine which of the following options is not a chemical change, we need to analyze each option based on the definitions of physical and chemical changes.

### Step-by-Step Solution:

1. **Understanding Chemical Changes**:
- A chemical change involves the breaking of old chemical bonds and the formation of new chemical bonds. This results in the formation of new substances.

2. **Understanding Physical Changes**:
- A physical change involves a change in the state of matter (like solid to liquid) without the formation of new substances. There is no breaking or forming of chemical bonds.

3. **Analyzing the Options**:
- **Option 1: Ripening of bananas**:
- This is a chemical change because it involves a change in color and texture, indicating the breakdown of constituents and formation of new substances.

- **Option 2: Souring of milk**:
- This is also a chemical change as it involves the production of lactic acid, which is a new substance formed from the milk.

- **Option 3: Decaying of the jute bag**:
- This is a chemical change because the bonds in the jute bag break down, leading to the formation of new substances as it decays.

- **Option 4: Drying of cotton cloth**:
- This is a physical change. When cotton cloth dries, water evaporates, but no new substances are formed. The chemical composition of the cotton remains the same.

4. **Conclusion**:
- The option that is not a chemical change is **Option 4: Drying of cotton cloth**.

### Final Answer:
The correct answer is **Option 4: Drying of cotton cloth**.

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