JEE Main 2017 · 2 Apr · Shift 1 · Chemistry Q36

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ChemistrySingle correct+4 / -1Question 36 of 90

Given $E^\circ_{\ce{Cl2/Cl-}}=1.36$ V, $E^\circ_{\ce{Cr^3+/Cr}}=-0.74$ V, $E^\circ_{\ce{Cr2O7^2-/Cr^3+}}=1.33$ V, $E^\circ_{\ce{MnO4-/Mn^2+}}=1.51$ V.

Among the following, the strongest reducing agent is :

\ce{Cr^3+}

\ce{Cl-}

\ce{Mn^2+}

Answer and worked solution

Official answer: C

The strongest reducing agent is the species most easily oxidised, i.e. the one with the most negative reduction potential: Cr ( $E^\circ_{\ce{Cr^3+/Cr}}=-0.74$ V).

Topics:Galvanic cells and EMF

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JEE Main 2017 · 2 Apr · Shift 1, Chemistry question 36