The metal which can be used to obtain metallic Cu from aqueous ` CuSO _ 4 ` solution is

Options

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

Explanation

To determine which metal can be used to obtain metallic copper (Cu) from an aqueous copper(II) sulfate (CuSO₄) solution, we need to consider the reactivity series of metals. Here's a step-by-step solution:

### Step 1: Understand the Reaction
When a metal is placed in a solution of copper(II) sulfate, a displacement reaction can occur if the metal is more reactive than copper. The general reaction can be represented as:
\[ \text{Metal} + \text{CuSO}_4 \rightarrow \text{Metal sulfate} + \text{Cu} \]

### Step 2: Identify the Reactivity Series
The reactivity series of metals ranks metals from most reactive to least reactive. Some common metals in the reactivity series include:
- Potassium (K)
- Sodium (Na)
- Calcium (Ca)
- Magnesium (Mg)
- Aluminum (Al)
- Zinc (Zn)
- Iron (Fe)
- Lead (Pb)
- Copper (Cu)
- Silver (Ag)
- Gold (Au)

### Step 3: Select a Suitable Metal
To displace copper from copper(II) sulfate, we need to choose a metal that is higher in the reactivity series than copper. Metals such as zinc (Zn), aluminum (Al), and magnesium (Mg) are more reactive than copper.

### Step 4: Conclusion
Among the metals that can displace copper from copper(II) sulfate, zinc (Zn) is commonly used. Therefore, the metal that can be used to obtain metallic copper from an aqueous CuSO₄ solution is zinc (Zn).

### Final Answer
The metal which can be used to obtain metallic Cu from aqueous CuSO₄ solution is **Zinc (Zn)**.

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