Which of the following does not evolve oxygen at anode when the electrolysis is carried out of

Options

A. Dilute `H_(2)SO_(4)` with `Pt` electrode
B. Fused sodium hydroxide with `Pt` electrodes
C. Acidic water with `Pt` electrodes
D. Dilute sulphuric acid using `Cu` electrodes

Explanation

To solve the question of which of the following does not evolve oxygen at the anode during electrolysis, we will analyze each option step by step.

### Step-by-Step Solution:

1. **Understanding Electrolysis:**
Electrolysis involves the breakdown of a substance into its components using electricity. The reactions occur at two electrodes: the anode (positive electrode) and the cathode (negative electrode).

2. **Analyzing Option A: Dilute H2SO4 with PT Electrode:**
- In dilute sulfuric acid (H2SO4), we have H⁺ and OH⁻ ions.
- At the anode, OH⁻ ions are oxidized to produce oxygen gas (O2).
- The reaction can be represented as:
\[ 4OH^- \rightarrow 2H2O + O2 + 4e^- \]
- Therefore, O2 is evolved at the anode.

3. **Analyzing Option B: Fused Sodium Hydroxide with PT Electrode:**
- In fused sodium hydroxide (NaOH), we have Na⁺ and OH⁻ ions.
- At the anode, OH⁻ ions are again oxidized to produce oxygen gas (O2).
- The reaction is similar to that in option A:
\[ 4OH^- \rightarrow 2H2O + O2 + 4e^- \]
- Thus, O2 is evolved at the anode.

4. **Analyzing Option C: Acidic Water with PT Electrode:**
- Acidic water contains H⁺ and OH⁻ ions.
- At the anode, OH⁻ ions are oxidized to produce oxygen gas (O2).
- The reaction can be represented as:
\[ 4OH^- \rightarrow 2H2O + O2 + 4e^- \]
- Therefore, O2 is evolved at the anode.

5. **Analyzing Option D: Dilute Sulfuric Acid Using Copper Electrode:**
- In this case, we have dilute sulfuric acid (H2SO4) with a copper (Cu) electrode.
- At the anode, copper is oxidized instead of OH⁻ ions:
\[ Cu \rightarrow Cu^{2+} + 2e^- \]
- Since the oxidation of copper occurs, there is no evolution of oxygen gas (O2) at the anode.

### Conclusion:
The option that does not evolve oxygen at the anode during electrolysis is **Option D: Dilute sulfuric acid using copper electrode**.