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NEET CHEMISTRYThe d-and f-Block ElementsMedium

Question

The E∘E^\circ value for the Mn3+/Mn2+Mn^{3+}/Mn^{2+} couple is more positive than that of Cr3+/Cr2+Cr^{3+}/Cr^{2+} or Fe3+/Fe2+Fe^{3+}/Fe^{2+} due to change of:

A

d5d^5 to d2d^2 configuration

B

d4d^4 to d5d^5 configuration

C

d3d^3 to d5d^5 configuration

D

d5d^5 to d4d^4 configuration

Step-by-Step Solution

The highly positive E∘E^\circ value for the Mn3+/Mn2+Mn^{3+}/Mn^{2+} reduction couple indicates a strong tendency for the Mn3+Mn^{3+} ion to accept an electron and get reduced to Mn2+Mn^{2+}. This is because Mn3+Mn^{3+} has a 3d43d^4 electronic configuration, while gaining an electron forms Mn2+Mn^{2+}, which possesses a highly stable, exactly half-filled 3d53d^5 configuration. Thus, the favourable change from a d4d^4 to a stable d5d^5 configuration is the primary reason for its high reduction potential .

Exam Context & Concepts Covered

This question aligns with the NEET CHEMISTRY syllabus, specifically targeting concepts from The d-and f-Block Elements. Mastering this topic is crucial for scoring well in the upcoming medical entrance examinations. Solving conceptually related problems will help you understand the nuances of these concepts and improve your problem-solving speed.

CHEMISTRYThe d-and f-Block Elementscouplepositivechange

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C.Absence of π-bonding.
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The incorrect statement among the following is:

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B.Actinoids are highly reactive metals, especially when finely divided.
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Identify the incorrect statement among the following:

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A.$\text{CrO}_4^{2-}$
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