Which of the following cells is `//` are rechargeable or secondary cell `(s)` ?

Options

A. `Ni-Cd` cell
B. Mercury cell
C. Lead storage cell
D. Lithium battery

Explanation

To determine which of the given cells are rechargeable or secondary cells, we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Identify the Types of Cells**:
- Cells can be classified into two main categories: primary cells and secondary cells.
- **Primary Cells**: These are cells that can be used only once. Once they are discharged, they cannot be recharged and reused.
- **Secondary Cells**: These are rechargeable cells that can be used multiple times. They can be recharged after being discharged.

2. **Examine Each Option**:
- **Nickel Cadmium Cell (NiCd)**: This is a type of rechargeable battery. It can be recharged and used multiple times. Therefore, it is a secondary cell.
- **Mercury Cell**: This is a primary cell. Once it is discharged, it cannot be recharged. Therefore, it is not a secondary cell.
- **Lead Storage Cell (Lead-Acid Battery)**: This is also a rechargeable battery. It can be recharged and used multiple times. Therefore, it is a secondary cell.
- **Lithium Battery Cell**: Generally, lithium batteries are considered primary cells, especially in consumer electronics. They are not designed to be recharged. Therefore, they are not secondary cells.

3. **Conclusion**:
- The rechargeable or secondary cells among the options provided are:
- Nickel Cadmium Cell
- Lead Storage Cell

### Final Answer:
The rechargeable or secondary cells are **Nickel Cadmium Cell** and **Lead Storage Cell**.

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