Identify a true statement among the following.

Options

A. In a physical change composition changes.
B. Chemical change can easily be reversec.
C. physical change is a temporary change
D. In a chemical change no new substance (s) is`//` are formed.

Answer

To solve the question, "Identify a true statement among the following," we will analyze each option provided in the question step by step.

### Step-by-Step Solution:

1. **Understand the Types of Changes**:
- There are two main types of changes in chemistry: physical changes and chemical changes.
- A physical change involves a change in the state or appearance of a substance without altering its chemical composition. Examples include melting ice or boiling water.
- A chemical change results in the formation of new substances with different chemical properties. Examples include rusting iron or burning wood.

2. **Analyze the First Statement**:
- The first statement discusses physical change and its composition.
- It states that in a physical change, the composition does not change. This is true because, in physical changes, the substance remains the same at the molecular level, even if its state changes (e.g., ice to water).

3. **Analyze the Second Statement**:
- The second statement claims that a chemical change can easily be reversible.
- This statement is false because chemical changes typically result in new substances that cannot easily revert to their original form. For example, when wood burns, it turns into ash and gases, which cannot be turned back into wood.

4. **Analyze the Third Statement**:
- The third statement mentions that physical change is a temporary change.
- This is true because physical changes can often be reversed (e.g., freezing water into ice and then melting it back into water).

5. **Analyze the Fourth Statement**:
- The fourth statement claims that in a chemical change, no new substances are formed.
- This statement is false because the defining characteristic of a chemical change is the formation of new substances.

6. **Conclusion**:
- Based on the analysis, the true statements are:
- The first statement about physical change and composition is true.
- The third statement about physical change being temporary is also true.
- Since the question asks for a single true statement, and if only one option is correct, we would select the third option as the correct answer.

### Final Answer:
The true statement among the options is: **Physical change is a temporary change.**