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Chem Chemistry

ChemistryNEB 2082 (MCQs)

Which of the following is the maximum possible oxidation state of the transition metals in 3d series ? a) +3 b) +6 c) +7 d) +8

1

Answer

· Based on the official syllabus and past papers
Updated

The maximum possible oxidation state of transition metals in the 3d series is +7. This is observed in manganese (Mn), which exhibits the highest oxidation state of +7 in compounds like permanganate (MnO₄⁻).

1s22s22p63s23p64s23d5Mn (Z = 25): 1s2 2s2 2p6 3s2 3p6 4s2 3d5
Electron configuration of Mn (Z=25): 1s² 2s² 2p⁶ 3s² 3p⁶ **3d⁵ 4s²** → Shows how Mn loses **7 electrons (4s² + 3d⁵)** to reach **+7 OS** in MnO₄⁻ (permanganate)
01.753.55.257Sc3Ti4V5Cr6Mn7Fe6Co4Ni3Cu2Zn2Maximum recorded oxidation state in 3d series
Trend of maximum oxidation states across the 3d series (Mn peaks at +7).
MnO4-FeO42-CrO42-
Structures of oxoanions showing **highest oxidation states** in 3d series (Mn: +7, Fe/Cr: +6).

Other transition metals in the 3d series also show varying oxidation states, but none exceed +7. For example:

  • Iron (Fe) shows +6 in ferrates (FeO₄²⁻).
  • Chromium (Cr) shows +6 in chromates (CrO₄²⁻).
  • Cobalt (Co) and nickel (Ni) typically show lower oxidation states like +3 or +4.

Thus, +7 is the highest recorded oxidation state in the 3d series.

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