Using the data given below:
`E_(Cr_(2)O_(7)^(2-)|Cr^(3+))^(@)=1.33V E_(Cl_(2)|Cl^(-))^(@)=1.36V`
`E_(MnO_(4)^(-)|Mn^(2+))^(@)=1.51V E_(Cr^(3+)|Cr)=-0.74V`
Mark the strongest reducing agent.

Options

A. `Cl^(-)`
B. `Cr`
C. `Cr^(3+)`
D. `Mn ^(2+)`

Explanation

To determine the strongest reducing agent from the given data, we will follow these steps:

### Step 1: Understand the Concept of Reducing Agents
A reducing agent is a substance that donates electrons to another species and is itself oxidized in the process. The strength of a reducing agent can be determined by its oxidation potential; the higher the oxidation potential, the stronger the reducing agent.

### Step 2: Identify the Given Reduction Potentials
We have the following reduction potentials:
1. \( E^\circ (Cr_2O_7^{2-} | Cr^{3+}) = 1.33 \, V \)
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