Which of the following cells is rechargeable ?

Options

A. Lead storage cell
B. `Ni-Cd` cell
C. Edison cell `(` Iron `-` nickel cell `)`
D. All of these

Explanation

To determine which of the following cells is rechargeable, we need to understand the characteristics of rechargeable cells. Rechargeable cells are those in which the products formed during discharge can be converted back to their original substances when electrical energy is supplied.

### Step-by-Step Solution:

1. **Understanding Rechargeable Cells**:
- Rechargeable cells allow for the conversion of chemical energy to electrical energy and vice versa. During discharge, chemical reactions occur, producing products that can be converted back to reactants when charging.

2. **Analyzing the First Option: Lead Storage Cell**:
- The lead storage cell consists of lead (Pb) as the anode and a grid of lead oxide (PbO2) as the cathode. When the cell discharges, lead sulfate (PbSO4) is formed at both electrodes. When recharged, the lead sulfate decomposes back into lead and lead oxide, making this cell rechargeable.

3. **Analyzing the Second Option: Nickel Cadmium Cell**:
- The nickel cadmium cell has cadmium (Cd) as the anode and nickel oxide (NiO2) as the cathode, immersed in a potassium hydroxide (KOH) solution. During discharge, cadmium hydroxide and nickel hydroxide are formed. When recharged, these products revert to their original forms, indicating that this cell is also rechargeable.

4. **Analyzing the Third Option: Iron Nickel Cell**:
- The iron nickel cell consists of iron as the anode and nickel hydroxide (Ni(OH)3) as the cathode, with potassium hydroxide as the electrolyte. Similar to the previous cells, the products formed during discharge can be converted back to their original substances when the cell is recharged, confirming that this cell is also rechargeable.

5. **Conclusion**:
- Since all three types of cells (lead storage cell, nickel cadmium cell, and iron nickel cell) can be recharged, the correct answer is that all of these cells are rechargeable.

### Final Answer:
All of the above cells are rechargeable.

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