The \( \mathrm{E}^{0} \) values in respect of electrodes of chromium \( (\mathrm{Z}=24) \) manga...

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The \( \mathrm{E}^{0} \) values in respect of electrodes of chromium \( (\mathrm{Z}=24) \) manganese \( (\mathrm{Z}=25) \) and iron \( (\mathrm{Z}=26) \) are:
\[
\mathrm{Cr}^{3+} / \mathrm{Cr}^{2+}=-0.4 \mathrm{~V} ; \mathrm{Mn}^{3+} / \mathrm{Mn}^{2+}=+1.5 \mathrm{~V} ; \mathrm{Fe}^{3+} / \mathrm{Fe}^{2+}=+0.8 \mathrm{~V}
\]
\( P \)
On the basis of the above information compare the feasibilities of further oxidation of their \( +2 \) oxidation states.
W.
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