Write electrode reactions taking place in Ni-Cd cell. Is it primary or secondary cell?

Explanation

To solve the question regarding the nickel-cadmium (Ni-Cd) cell, we will follow these steps:

### Step 1: Identify the Type of Cell
The nickel-cadmium cell is classified as a **secondary cell**. This means it is a rechargeable cell that can store electrical energy in the form of chemical energy.

### Step 2: Write the Anode Reaction
At the anode (negative electrode) of the Ni-Cd cell, the following reaction occurs:
- Cadmium (Cd) reacts with hydroxide ions (OH⁻) to form cadmium oxide (CdO) and water (H₂O), while releasing two electrons (2e⁻).
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