The standard reduction potential for `Li^(+)//Li,Zn^(2+)//Zn,H^(+)//H_(2) and Ag^(+)//Ag` is -3.05, -0.762, 0.00 and +0.80V.
Which of the following has highest reducing capacity

Options

A. Ag
B. `H_(2)` is anode and `Cu` is cathode
C. `Zn`
D. `Li`

Explanation

To determine which of the given species has the highest reducing capacity based on their standard reduction potentials, we can follow these steps:

### Step 1: Understand Standard Reduction Potentials
Standard reduction potential (SRP) indicates how easily a species can be reduced. A more negative SRP means that the species is more likely to lose electrons (i.e., act as a reducing agent).

### Step 2: List the Given Standard Reduction Potentials
The standard reduction potentials provided are:
- \( \text{Li}^+ / \text{Li} \): -3.05 V
- \( \text{Zn}^{2+} / \text{Zn} \): -0.762 V
- \( \text{H}^+ / \text{H}_2 \): 0.00 V
- \( \text{Ag}^+ / \text{Ag} \): +0.80 V

### Step 3: Identify the Most Negative SRP
To find the highest reducing capacity, we need to identify which of these values is the most negative:
- \( \text{Li}^+ / \text{Li} \): -3.05 V (most negative)
- \( \text{Zn}^{2+} / \text{Zn} \): -0.762 V
- \( \text{H}^+ / \text{H}_2 \): 0.00 V
- \( \text{Ag}^+ / \text{Ag} \): +0.80 V

### Step 4: Conclusion
Since -3.05 V (for lithium) is the most negative value among the given standard reduction potentials, lithium has the highest reducing capacity.

### Final Answer
The species with the highest reducing capacity is **Lithium (Li)**.

---