Which of the following statements is not corr | vedclass

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(B) Option $B$ is incorrect because $MnO_{4}^{2-}$ (manganate ion) is stable in alkaline medium and is not a strong oxidizing agent compared to $MnO_{

Vedclass · Accepted Answer

$MnO_{4}^{2-}$ is a strong oxidizing agent but $CrO_{4}^{2-}$ is not.

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(B) Option $B$ is incorrect because $MnO_{4}^{2-}$ (manganate ion) is stable in alkaline medium and is not a strong oxidizing agent compared to $MnO_{4}^{-}$ (permanganate ion). $CrO_{4}^{2-}$ (chromate ion) is also not a strong oxidizing agent. Both are oxyanions in the $+6$ oxidation state. $A$ is correct: $E^{0}$ for $Fe^{3+}/Fe^{2+}$ is $+0.77 \ V$,while for $Mn^{3+}/Mn^{2+}$ it is $+1.51 \ V$. $C$ is correct: Due to lanthanoid contraction,the atomic radii of the second and third transition series are very similar. $D$ is correct: $Mn^{3+}$ is a strong oxidizing agent because $Mn^{2+}$ has a stable $d^{5}$ configuration,making the $E^{0}$ value for $Mn^{3+}/Mn^{2+}$ $(+1.51 \ V)$ much more positive than for $Cr^{3+}/Cr^{2+}$ $(-0.41 \ V)$.

Which of the following statements is not correct?

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