Electrolysis involves oxidation and reduction respectively at:

Options

A. Anode and cathode
B. Cathode and anode
C. At both the electrode
D. None of these

Explanation

To solve the question regarding the process of electrolysis and where oxidation and reduction occur, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Process of Electrolysis:**
- Electrolysis is a chemical process that uses electric current to drive a non-spontaneous reaction. It occurs in an electrolytic cell, which contains two electrodes: an anode and a cathode.

2. **Identify the Electrodes:**
- The anode is the positive electrode, while the cathode is the negative electrode. This distinction is crucial for understanding where oxidation and reduction take place.

3. **Define Oxidation and Reduction:**
- Oxidation is defined as the loss of electrons, while reduction is defined as the gain of electrons. These definitions are key to identifying the reactions occurring at each electrode.

4. **Determine Where Oxidation Occurs:**
- In electrolysis, oxidation occurs at the anode. This is because the anode attracts anions (negatively charged ions) which lose electrons during the oxidation process.

5. **Determine Where Reduction Occurs:**
- Conversely, reduction occurs at the cathode. The cathode attracts cations (positively charged ions) which gain electrons during the reduction process.

6. **Conclusion:**
- Therefore, in electrolysis, oxidation occurs at the anode and reduction occurs at the cathode.

7. **Select the Correct Option:**
- Based on the above analysis, the correct answer to the question is: **Option 1: at anode and cathode.**