The metal used to recover copper from a solution of `CuSO_(4)` is :

Options

A. Fe
B. Au
C. Hg
D. Ag

Explanation

To determine the metal used to recover copper from a solution of copper sulfate (CuSO₄), we can follow these steps:

### Step 1: Understand the Reaction
Copper sulfate dissociates in solution to form copper ions (Cu²⁺) and sulfate ions (SO₄²⁻). The recovery of copper means reducing Cu²⁺ ions to solid copper (Cu).

### Step 2: Identify the Displacement Reaction
To recover copper from CuSO₄, we need a metal that can displace copper from the solution. This is based on the reactivity series of metals, where a more reactive metal can displace a less reactive metal from its compound.

### Step 3: Consult the Electrochemical Series
In the electrochemical series, metals are arranged in order of their reactivity. Metals above copper can displace it from its compounds, while those below cannot.

### Step 4: Analyze the Given Options
The options provided are:
- Iron
- Gold
- Mercury
- Silver

### Step 5: Compare the Metals with Copper
From the electrochemical series:
- Iron (Fe) is above copper (Cu) and can displace it.
- Gold (Au), Mercury (Hg), and Silver (Ag) are all below copper in the series and cannot displace it.

### Step 6: Conclusion
Since iron is the only metal among the options that is above copper in the electrochemical series, it can effectively displace copper from copper sulfate solution.

### Final Answer
The metal used to recover copper from a solution of CuSO₄ is **Iron (Fe)**.

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