Chemistry Transition Elements MDCAT 2017
PMDC Verified Question 55 of 68
Identify the element that has maximum oxidation states:
A
Zinc
B
Vanadium
C
Chromium
D
Manganese
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Manganese
Concept:

The maximum oxidation state of a transition metal is generally determined by the sum of its \(4s\) and \(3d\) electrons.

Solution:

  • Manganese (\(Z=25\)): Configuration is \([Ar] \; 3d^5 \; 4s^2\). It has a total of 7 valence electrons. It can lose all 7 to exhibit a maximum oxidation state of +7 (e.g., in \(KMnO_4\)).


  • Chromium: Maximum is +6 (\(3d^5 \; 4s^1\)).


  • Vanadium: Maximum is +5 (\(3d^3 \; 4s^2\)).


  • Zinc: Only shows +2 (\(3d^{10} \; 4s^2\), d-electrons are fully paired and do not participate).


Why other options are incorrect:

  • None of the other elements have as many unpaired \(d\)-electrons combined with \(s\)-electrons capable of participating in bonding as Manganese does.

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