Electrolysis of an aqueous solution of `AgNO_3` with silver electrodes produce __(i)___ at cathode while ___(ii)___ ions are dissolved from anode. When Pt electrodes are used ____(iii)___ is produced at anode ___(iv)___ at cathode.

Options

A. `{:("(i)","(ii)","(iii)","(iv)"),(H_2,NO_3^(-) , OH^(-), H_2):}`
B. `{:("(i)","(ii)","(iii)","(iv)"),(Ag,H^+, O_2, H_2):}`
C. `{:("(i)","(ii)","(iii)","(iv)"),(Ag,H^(+),O_(2),Ag):}`
D. `{:("(i)","(ii)","(iii)","(iv)"),("Ag","H"^(+),"Ag"^(+),"O"_(2)):}`

Answer

To solve the question regarding the electrolysis of an aqueous solution of AgNO₃ with silver electrodes, let's break it down step by step.

### Step-by-Step Solution:

1. **Identify the Electrolysis Process**:
- Electrolysis involves the breakdown of a compound in solution using an electric current. In this case, we are dealing with an aqueous solution of silver nitrate (AgNO₃).

2. **Electrodes Used**:
- The question specifies that silver electrodes are used initially. This means that both the anode and cathode are made of silver.

3. **Reactions at the Cathode**:
- At the cathode, reduction occurs. The silver ions (Ag⁺) in the solution gain electrons to form solid silver (Ag).
- The half-reaction can be written as:
\[ \text{Ag}^+ + e^- \rightarrow \text{Ag} \]
- Therefore, the product at the cathode is **silver (Ag)**.

4. **Reactions at the Anode**:
- At the anode, oxidation occurs. Silver from the electrode dissolves into the solution as silver ions (Ag⁺).
- The half-reaction can be written as:
\[ \text{Ag} \rightarrow \text{Ag}^+ + e^- \]
- Thus, silver ions (Ag⁺) are dissolved from the anode.

5. **Using Platinum Electrodes**:
- When platinum electrodes are used instead of silver, the reactions change slightly. At the cathode, silver ions (Ag⁺) are still reduced to form solid silver (Ag).
- At the anode, water undergoes oxidation to produce oxygen gas (O₂) and hydrogen ions (H⁺).
- The half-reaction for the anode can be written as:
\[ 2 \text{H}_2\text{O} \rightarrow \text{O}_2 + 4 \text{H}^+ + 4 e^- \]
- Thus, the product at the anode is **oxygen gas (O₂)**.

### Final Answers:
- (i) Ag (silver) is produced at the cathode.
- (ii) Ag⁺ (silver ions) are dissolved from the anode.
- (iii) O₂ (oxygen gas) is produced at the anode when platinum electrodes are used.
- (iv) Ag (silver) is produced at the cathode.

### Summary of Answers:
- (i) Ag
- (ii) Ag⁺
- (iii) O₂
- (iv) Ag