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  3. Chemistry
  4. The standard reduction potentials at 298 K for the following half-cell reactions are given below Zn 2+(a q)+2 e- leftharpoons Zn (s)-0.762 Cr 3+(a q)+3 e- leftharpoons Cr (s)-0.74 2 H +(a q)+2 e- leftharpoons H 2(g) 0.00 Fe 3+(a q)+e- leftharpoons Fe 2+(a q)+0.77 Which one of the following is the strongest reducing agent?

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Q. The standard reduction potentials at $298\, K$ for the following half-cell reactions are given below
$Zn ^{2+}(a q)+2 e^{-} \rightleftharpoons Zn (s)-0.762$
$Cr ^{3+}(a q)+3 e^{-} \rightleftharpoons Cr (s)-0.74$
$2 H ^{+}(a q)+2 e^{-} \rightleftharpoons H _{2}(g) 0.00$
$Fe ^{3+}(a q)+e^{-} \rightleftharpoons Fe ^{2+}(a q)+0.77$
Which one of the following is the strongest reducing agent?

ManipalManipal 2008Electrochemistry

Solution:

The metals having higher negative value of standard reduction potential are placed above hydrogen in electrochemical series. The metals placed above hydrogen has a great tendency to donate electrons or to undergo oxidation. The metals having great power to undergo oxidation are strongest reducing agent. $ Zn $ has highest negative value of standard reduction potential. Therefore, it is the strongest reducing agent.