Which one of the following is different from others?

Options

A. Daniel cell
B. Voltaic cell
C. Galvanic cell
D. Electrolytic cell

Answer

To determine which of the following options is different from the others among Daniel cell, Voltaic cell, Galvanic cell, and Electrolytic cell, we can follow these steps:

### Step 1: Understand the Types of Cells
- There are two main types of electrochemical cells:
1. **Electrochemical Cells** (which include Galvanic and Voltaic cells)
2. **Electrolytic Cells**

### Step 2: Define Each Cell Type
- **Electrochemical Cells**: These cells convert chemical energy into electrical energy. They are spontaneous in nature.
- **Galvanic Cell**: A type of electrochemical cell that generates electrical energy from spontaneous chemical reactions. Example: Daniel cell.
- **Voltaic Cell**: Another name for a Galvanic cell, which also converts chemical energy to electrical energy.

- **Electrolytic Cell**: This cell converts electrical energy into chemical energy. It requires an external power source to drive non-spontaneous reactions.

### Step 3: Analyze the Options
- **Daniel Cell**: An example of an electrochemical cell (Galvanic cell).
- **Voltaic Cell**: Another name for an electrochemical cell (Galvanic cell).
- **Galvanic Cell**: A type of electrochemical cell.
- **Electrolytic Cell**: Converts electrical energy to chemical energy and is not spontaneous.

### Step 4: Identify the Odd One Out
- The first three options (Daniel cell, Voltaic cell, and Galvanic cell) are all types of electrochemical cells that generate electrical energy from chemical reactions.
- The Electrolytic cell is fundamentally different as it requires electrical energy to drive a chemical reaction.

### Conclusion
The cell that is different from the others is the **Electrolytic Cell**.

### Final Answer
The answer to the question is **Electrolytic Cell** (Option 4).

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