Which cell will measure standard electrode potential of copper electrode?
(a) `Pt(s)|H_(2)(g ,0.1"bar")|H^(+)(aq.,1M)||Cu^(2+)(aq,1M)|Cu`
(b)`Pt(s)|H_(2)(g,1"bar")|H^(+)(aq ,1M)||Cu^(1+)(aq,2M)|Cu`
(c) `Pt(s)|H_(2)(g ,1"bar")|H^(+)(aq,1M)||Cu^(2+)(aq,1M)|Cu`
(d) `Pt(s)|H_(2)(g,1"bar")|H^(+)(aq,1M)||C u^(2+) (aq,1M)|Cu`

Options

A. `Pt(s)|H_(2)(g ,0.1"bar")|H^(+)(aq.,1M)||Cu^(2+)(aq,1M)|Cu`
B. `Pt(s)|H_(2)(g,1"bar")|H^(+)(aq ,1M)||Cu^(1+)(aq,2M)|Cu`
C. `Pt(s)|H_(2)(g ,1"bar")|H^(+)(aq,1M)||Cu^(2+)(aq,1M)|Cu`
D. `Pt(s)|H_(2)(g,1"bar")|H^(+)(aq,1M)||C u^(2+) (aq,1M)|Cu`

Explanation

To determine which cell measures the standard electrode potential of the copper electrode, we need to analyze the given options based on the Nernst equation and the conditions for measuring standard electrode potential.

### Step-by-Step Solution:

1. **Understanding Standard Electrode Potential**:
- Standard electrode potential is measured under standard conditions: 1 M concentration for all aqueous species, 1 bar pressure for gases, and a temperature of 25°C (298 K).

2. **Identifying the Components of Each Cell**:
- Each option represents a galvanic cell with a hydrogen electrode as the anode and a copper electrode as the cathode. The standard hydrogen electrode (SHE) is used as a reference.

3. **Analyzing Each Option**:
- **Option (a)**: `Pt(s)|H2(g, 0.1 bar)|H+(aq, 1M)||Cu2+(aq, 1M)|Cu`
- Here, the pressure of H2 is 0.1 bar (not 1 bar). This does not meet the standard condition.
- **Option (b)**: `Pt(s)|H2(g, 1 bar)|H+(aq, 1M)||Cu+(aq, 2M)|Cu`
- The concentration of Cu+ is 2 M (not 1 M). This does not meet the standard condition.
- **Option (c)**: `Pt(s)|H2(g, 1 bar)|H+(aq, 1M)||Cu2+(aq, 1M)|Cu`
- Here, both the pressure of H2 is 1 bar and the concentration of Cu2+ is 1 M. This meets the standard conditions.
- **Option (d)**: `Pt(s)|H2(g, 1 bar)|H+(aq, 1M)||Cu2+(aq, 1M)|Cu`
- This is identical to option (c), hence it also meets the standard conditions.

4. **Conclusion**:
- The only option that correctly measures the standard electrode potential of the copper electrode under standard conditions is **Option (c)**.

### Final Answer:
**(c) Pt(s)|H2(g, 1 bar)|H+(aq, 1M)||Cu2+(aq, 1M)|Cu**