MCQ
Using the data given below find out the strongest reducing agent. $\text{E}^\ominus_{\text{cr}_2\text{O}^{2-}_7/\text{cr}^{3+}}=1.33\text{V}\ \ \ \text{E}^\ominus_{\text{Cl}_2/\text{Cl}^-}=1.36\text{V}$ $\text{E}^\ominus_{\text{MnO}^-_4/\text{Mn}^{2+}}=1.51\text{V}\ \ \ \ \text{E}^\ominus_{\text{Cr}^{3+}/\text{Cr}}=-0.74\text{V}$
  • A
    $\text{Cl}^-$
  • $\text{Cr}$
  • C
    $\text{Cr}^{3+}$
  • D
    $\text{Mn}^{2+}$

Answer

Correct option: B.
$\text{Cr}$
A negative value of standard reduction potential for $\mathrm{Cr}^{3+}$ to $Cr$ means that the redox couple is a stronger reducing agent.

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