The chemical reaction
`2AgCl_("(fused)")+H_(2(g))rarr2HCl_((aq))+2Ag_((s))`
taking place in a galvanic cell is represented by the notation

Options

A. `Pt_((g))|H_(2(g))," bar "|1MKCl_((aq))|AgCl_((x))|Ag_((g))`
B. `Pt_((x))|H_(2(g)),1" bar "|1MHCl_((aq))|1MAg_((aq))^(+)|Ag_((x))`
C. `Pt_((x))|H_(2(g)), 1" bar "|1MHCl_((aq))|AgCl_((g))|Ag_((x))`
D. `Pt_((x))|H_(2(g)),1" bar "|1MHCl_((aq))|Ag_((x))|AgCl_((x))`

Explanation

To solve the problem, we need to represent the given chemical reaction in the notation used for galvanic cells. The reaction is:

\[ 2 \text{AgCl (fused)} + \text{H}_2 \text{(g)} \rightarrow 2 \text{HCl (aq)} + 2 \text{Ag (s)} \]

### Step-by-Step Solution:

1. **Identify the Components of the Reaction**:
- The reactants are fused AgCl and hydrogen gas (H₂).
- The products are aqueous HCl and solid silver (Ag).

2. **Determine the Oxidation and Reduction**:
- In this reaction, silver ions (Ag⁺) from AgCl are reduced to solid silver (Ag).
- Hydrogen gas (H₂) is oxidized to H⁺ ions in the formation of HCl.

3. **Identify the Anode and Cathode**:
- The cathode is where reduction occurs. Here, Ag⁺ ions are reduced to Ag.
- The anode is where oxidation occurs. Here, H₂ is oxidized to H⁺ ions.

4. **Write the Half-Reactions**:
- **Reduction Half-Reaction**:
\[ \text{Ag}^+ + e^- \rightarrow \text{Ag (s)} \]
- **Oxidation Half-Reaction**:
\[ \text{H}_2 \rightarrow 2 \text{H}^+ + 2e^- \]

5. **Combine the Half-Reactions**:
- To balance the electrons, we can multiply the reduction half-reaction by 2:
\[ 2 \text{Ag}^+ + 2e^- \rightarrow 2 \text{Ag (s)} \]
- Now, we can combine the half-reactions:
\[ 2 \text{Ag}^+ + \text{H}_2 \rightarrow 2 \text{Ag (s)} + 2 \text{H}^+ \]

6. **Write the Cell Notation**:
- The standard notation for a galvanic cell is:
\[ \text{Anode} | \text{Anode Solution} || \text{Cathode Solution} | \text{Cathode} \]
- For our reaction:
\[ \text{H}_2(g) | \text{HCl (aq)} || \text{Ag}^+(aq) | \text{Ag (s)} \]

7. **Select the Correct Option**:
- Based on the options provided, we can identify the correct representation of the galvanic cell.

### Final Answer:
The correct notation for the galvanic cell representing the reaction is:
\[ \text{H}_2(g) | \text{HCl (aq)} || \text{Ag}^+(aq) | \text{Ag (s)} \]