Why does mercury cell gives a constant voltage throughout its life ?

Explanation

To understand why a mercury cell provides a constant voltage throughout its life, we can break down the explanation into several steps:

### Step-by-Step Solution:

1. **Understanding the Mercury Cell**:
- A mercury cell is a type of electrochemical cell that uses mercury as a key component. It typically consists of a zinc anode and a mercury oxide cathode, with a potassium hydroxide (KOH) electrolyte.

2. **Electrochemical Reactions**:
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