MODEL PAPER 2 — Chemistry STD 12 Science — Question
Rajasthan BoardEnglish MediumSTD 12 ScienceChemistryMODEL PAPER 22 Marks
Question
Why is $Cr^{2+}$ reducing and $Mn^{3+}$ oxidising when both have $d^4$ configuration$?$
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Answer
Chromium $Cr^{2+}$ is reducing as its configuration changes from $d^4$ to $d^3,$ the latter having a half-filled $t_{2g}$ level. On the other hand, the change from $($Manganese$) Mn^{3+}$ to $Mn^{2+}$ results in the half-filled $(d^5)$ configuration which has extra stability.
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