Which of the following metals will not react with a solution of `CuSO_(4)`

Options

A. Fe
B. Zn
C. Mg
D. Hg

Explanation

To determine which of the given metals will not react with a solution of `CuSO4`, we can follow these steps:

### Step 1: Understand the Reactivity Series
The reactivity series is a list of metals arranged in order of decreasing reactivity. Metals that are more reactive can displace less reactive metals from their compounds in solution.

### Step 2: Identify the Metals
The metals given in the question are:
- Iron (Fe)
- Zinc (Zn)
- Magnesium (Mg)
- Mercury (Hg)

### Step 3: Compare the Reactivity of the Metals with Copper
In the reactivity series, the order of the metals from most reactive to least reactive is approximately:
- Magnesium (Mg)
- Zinc (Zn)
- Iron (Fe)
- Mercury (Hg)

Copper (Cu) is less reactive than magnesium, zinc, and iron but more reactive than mercury.

### Step 4: Determine Which Metal Will Not React with `CuSO4`
Since more reactive metals can displace copper from `CuSO4`, we need to identify which of the metals listed cannot displace copper:
- Magnesium (Mg) can displace copper.
- Zinc (Zn) can displace copper.
- Iron (Fe) can displace copper.
- Mercury (Hg) cannot displace copper because it is less reactive than copper.

### Conclusion
Thus, the metal that will not react with a solution of `CuSO4` is **Mercury (Hg)**.

### Summary of Steps:
1. Understand the reactivity series.
2. Identify the metals in the question.
3. Compare the reactivity of these metals with copper.
4. Determine which metal cannot displace copper from `CuSO4`.

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