Assertion : E^o for Mn^{3+}/Mn^{2+} is more p | vedclass

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(A) The standard reduction potential $E^o$ for $Mn^{3+}/Mn^{2+}$ $(+1.51 \ V)$ is much higher than that for $Cr^{3+}/Cr^{2+}$ $(-0.41 \ V)$.This is be

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If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.

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(A) The standard reduction potential $E^o$ for $Mn^{3+}/Mn^{2+}$ $(+1.51 \ V)$ is much higher than that for $Cr^{3+}/Cr^{2+}$ $(-0.41 \ V)$.This is because $Mn^{2+}$ has a stable $d^5$ configuration,making the reduction of $Mn^{3+}$ to $Mn^{2+}$ highly favorable.Conversely,the third ionization energy of $Mn$ is very high because it involves removing an electron from the stable $d^5$ configuration of $Mn^{2+}$.Since the third ionization energy is a measure of the energy required to remove an electron from the $M^{2+}$ ion,the high value for $Mn$ explains why $Mn^{3+}$ is a strong oxidizing agent.Therefore,both Assertion and Reason are correct,and the Reason is the correct explanation for the Assertion.

Assertion : $E^o$ for $Mn^{3+}/Mn^{2+}$ is more positive than $Cr^{3+}/Cr^{2+}$.
Reason : The third ionization energy of $Mn$ is larger than that of $Cr$.

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Assertion : $E^o$ for $Mn^{3+}/Mn^{2+}$ is more positive than $Cr^{3+}/Cr^{2+}$.Reason : The third ionization energy of $Mn$ is larger than that of $Cr$.