Identify the false statement among the following.

Options

A. Compound is homogeneous in nature.
B. In compounds constituents do not retain properties
C. The constituents of mixture can be separated by physical method.
D. during formation of mixtures there is a change in the molecular composition

Explanation

To identify the false statement among the given options, let's analyze each statement step by step.

### Step-by-Step Solution:

1. **Understanding Compounds**:
- A compound is a substance formed when two or more chemical elements combine in a fixed ratio.
- Compounds have a uniform composition, meaning they are homogeneous in nature.

**Statement 1**: "Compound is homogenous in nature."
- This statement is **true** because compounds have a uniform composition.

2. **Properties of Constituents in Compounds**:
- When elements combine to form a compound, they lose their individual properties.
- For example, water (H₂O) is made from hydrogen and oxygen. While hydrogen supports combustion, water does not.

**Statement 2**: "The constituents of a compound do not retain their properties."
- This statement is **true** as the properties of the individual elements change when they form a compound.

3. **Mixtures and Separation**:
- A mixture is formed by combining two or more substances without any chemical change.
- The components of a mixture can be separated by physical methods (like filtration, evaporation, etc.).

**Statement 3**: "The constituents of a mixture can be separated by physical method."
- This statement is **true** because mixtures can be separated physically.

4. **Molecular Composition in Mixtures**:
- When forming a mixture, the substances are physically combined, and there is no change in their molecular composition.
- This means that the individual properties and compositions of the substances remain intact.

**Statement 4**: "During the formation of a mixture, there is a change in the molecular composition."
- This statement is **false** because there is no change in the molecular composition when forming a mixture.

### Conclusion:
The false statement among the options is **Statement 4**: "During the formation of a mixture, there is a change in the molecular composition."

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