The reaction in which to compounds exchange their ions to form two compounds is called

Options

A. a displacement reaction
B. a decomposition reaction
C. an isomerization reaction
D. a metathesi reaction

Answer

To solve the question, we need to identify the type of chemical reaction described. The question states that two compounds exchange their ions to form two new compounds. Let's break this down step by step.

### Step-by-Step Solution:

1. **Understanding the Reaction**:
- The question describes a reaction where two compounds exchange their ions. This means that the ions from one compound switch places with the ions from another compound.

2. **Identifying the Type of Reaction**:
- The reaction where ions are exchanged between two compounds is known as a **double displacement reaction**. This is also referred to as a **metathesis reaction**.

3. **Example of the Reaction**:
- To illustrate, consider the reaction between iron(II) sulfate (FeSO4) and copper(II) chloride (CuCl2).
- In this reaction, the iron (Fe²⁺) from FeSO4 exchanges places with the copper (Cu²⁺) from CuCl2, resulting in the formation of copper(II) sulfate (CuSO4) and iron(II) chloride (FeCl2).

4. **Conclusion**:
- Therefore, the correct answer to the question is that the reaction in which two compounds exchange their ions to form two new compounds is called a **double displacement reaction** or a **metathesis reaction**.

### Final Answer:
The reaction in which two compounds exchange their ions to form two new compounds is called a **double displacement reaction** (or **metathesis reaction**).