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Strongest reducing agent, or order of reducing power, from standard reduction potentials

This type of question, asked 2 times: 24 Jan 2025, 22 Jan 2026 S2. All 2 questions below, oldest first.

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  1. Question 1

    24 Jan 2025

    101
    Based on the data given below:
    ECr2O72−/Cr3+0=1.33 VECl2/Cl(−)0=1.36 VEMnO4−/Mn2+0=1.51 VECr3+/Cr0=−0.74 V\begin{matrix} E_{Cr_{2}O_{7}^{2 -}/Cr^{3 +}}^{0}= 1.33\text{ }V & E_{Cl_{2}/Cl^{( - )}}^{0}= 1.36\text{ }V \\ E_{MnO_{4}^{-}/Mn^{2 +}}^{0}= 1.51\text{ }V & E_{Cr^{3 +}/Cr}^{0}= - 0.74\text{ }V \end{matrix}
    the strongest reducing agent is :

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  2. Question 2

    22 Jan 2026 S2

    42
    Consider the following reduction processes :
    Al3++3e−→Al(s),E∘=−1.66 VFe3++e−→Fe2+,E∘=+0.77 VCo3++e−→Co2+,E∘=+1.81 VCr3++3e−→Cr(s),E∘=−0.74 V\begin{matrix} Al^{3+} + 3e^{-} \rightarrow Al(s), & E^{\circ} = -1.66\ V \\ Fe^{3+} + e^{-} \rightarrow Fe^{2+}, & E^{\circ} = +0.77\ V \\ Co^{3+} + e^{-} \rightarrow Co^{2+}, & E^{\circ} = +1.81\ V \\ Cr^{3+} + 3e^{-} \rightarrow Cr(s), & E^{\circ} = -0.74\ V \end{matrix}
    The tendency to act as reducing agent decreases in the order :

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