Single displacement reaction is also known as a ……………… reaction.

Explanation

**Step-by-Step Solution:**

1. **Understanding Single Displacement Reaction**: A single displacement reaction is a type of chemical reaction where one element displaces another in a compound. This occurs when a more reactive element replaces a less reactive element in a compound.

2. **Definition**: The definition can be summarized as: "A reaction in which a more reactive substance displaces a less reactive substance from its molecule."

3. **Example**: To illustrate this, consider the reaction between zinc (Zn) and copper sulfate (CuSO₄). When zinc is added to copper sulfate, the reaction can be represented as:
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