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  • Given below are the half reactions with their standard reduction potential at a temperature of <img alt="298 \mathrm{~K}" src="https://entrancecorner.oncodecogs.com/gif.latex?298%20%5Cmathrm%7B%7EK

Given below are the half reactions with their standard reduction potential at a temperature of 298 \mathrm{~K}. Compare those and select the correct option representing the decreasing order of reducing strength.
\mathrm{\begin{array}{ll} 2 \mathrm{H}^{+}(\text {aq })+2 e^{-} \rightleftharpoons \mathrm{H}_2(\mathrm{~g}) & 0.000 \\ \mathrm{~Fe}^{3+}(\mathrm{aq})+\mathrm{e}^{-} \rightleftharpoons \mathrm{Fe}^{2+}(\mathrm{aq}) & 0.770 \\ \mathrm{Cr}^{3+}(\mathrm{aq})+3 e^{-} \rightleftharpoons \mathrm{Cr}(\mathrm{s}) & -0.740 \\ \mathrm{Zn}^{2+}(\mathrm{aq})+2 e^{-} \rightleftharpoons \mathrm{Zn}(\mathrm{s}) & -0.762 \end{array}}

Option: 1

\mathrm{Fe}^{3+}>\mathrm{H}^{+}>\mathrm{Cr}^{3+}+\mathrm{Zn}^{2+}


Option: 2

\mathrm{Z n^{2+}>\mathrm{Cr}^{3+}>\mathrm{H}^{+}>\mathrm{Fe}^{3+}}


Option: 3

\mathrm{Zn}^{2+}>\mathrm{Cr}^{3+}>\mathrm{Fe}^{3+}>\mathrm{H}^{+}


Option: 4

\mathrm{H}^{+}>\mathrm{Fe}^{3+}>\mathrm{Cr}^{3+}>\mathrm{Zn}^{2+}


Answers (1)

best_answer

The species with the highest negative value of reduction potential will be the one that is most easily oxidised.

Posted by

Pankaj

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