The standard reduction potentials at 298 K f | vedclass

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(A) reducing agent is a substance that undergoes oxidation,and its strength is determined by its standard oxidation potential. The standard oxidation

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$Zn_{(s)}$

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(A) reducing agent is a substance that undergoes oxidation,and its strength is determined by its standard oxidation potential. The standard oxidation potential is the negative of the standard reduction potential $(E^\circ_{ox} = -E^\circ_{red})$.$1$. For $Zn_{(s)} \rightarrow Zn^{2+} + 2e^-$,$E^\circ_{ox} = -(-0.762 \ V) = +0.762 \ V$$2$. For $Cr_{(s)} \rightarrow Cr^{3+} + 3e^-$,$E^\circ_{ox} = -(-0.740 \ V) = +0.740 \ V$$3$. For $H_{2(g)} \rightarrow 2H^+ + 2e^-$,$E^\circ_{ox} = -(0.00 \ V) = 0.00 \ V$$4$. For $Fe^{2+} \rightarrow Fe^{3+} + e^-$,$E^\circ_{ox} = -(0.770 \ V) = -0.770 \ V$Since $Zn_{(s)}$ has the highest standard oxidation potential $(+0.762 \ V)$,it is the strongest reducing agent among the given options.

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