Daniel cell is electrochemical cell , which of the following statement is true about it ?

Options

A. Cations move toward zinc electrode
B. Current flows zinc electrode to copper electrode
C. Cations move toward copper electrode which is cathode
D. Electrons flow from copper electrode to zinc electrode

Answer

To determine which statement is true about the Daniel cell, we need to analyze the functioning of the cell and the movement of ions and electrons.

### Step-by-Step Solution:

1. **Understanding the Components of a Daniel Cell**:
- A Daniel cell consists of two electrodes: a zinc electrode (anode) and a copper electrode (cathode).
- The zinc electrode is immersed in a zinc sulfate solution, while the copper electrode is immersed in a copper sulfate solution.

**Hint**: Remember the roles of anode and cathode in electrochemical cells.

2. **Identifying the Reactions**:
- At the anode (zinc electrode), oxidation occurs:
\[ \text{Zn (s)} \rightarrow \text{Zn}^{2+} (aq) + 2e^- \]
- At the cathode (copper electrode), reduction occurs:
\[ \text{Cu}^{2+} (aq) + 2e^- \rightarrow \text{Cu (s)} \]

**Hint**: Oxidation involves loss of electrons, while reduction involves gain of electrons.

3. **Movement of Ions**:
- Cations (Zn²⁺ ions) produced at the anode will not move towards the zinc electrode; instead, they will remain in the solution.
- Cations (Cu²⁺ ions) in the copper sulfate solution will move towards the copper electrode (cathode) to get reduced.

**Hint**: Cations move towards the electrode where they can gain electrons (reduction).

4. **Flow of Electrons**:
- Electrons flow from the zinc electrode (anode) to the copper electrode (cathode) through an external circuit.
- The current, which is the flow of positive charge, flows in the opposite direction, from the copper electrode to the zinc electrode.

**Hint**: Current flows in the direction opposite to the flow of electrons.

5. **Evaluating the Statements**:
- **Statement 1**: "Cation moves towards zinc electrode" - **False** (Cations move towards the copper electrode).
- **Statement 2**: "Current flows from zinc electrode to copper electrode" - **False** (Current flows from copper to zinc).
- **Statement 3**: "Cation moves towards copper electrode which is cathode" - **True** (Cations move towards the cathode).
- **Statement 4**: "Electron flows from copper electrode to zinc electrode" - **False** (Electrons flow from zinc to copper).

**Hint**: Carefully analyze each statement based on the principles of electrochemistry.

### Conclusion:
The correct statement about the Daniel cell is **Statement 3**: "Cation moves towards copper electrode which is cathode."