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MHT CET2010Chemistryd and f Block Elements

Which gives +7 oxidation state?

Options

  1. AMn (25)
  2. BCr (24)
  3. CCu (29)
  4. DFe (26)

Correct answer

A. Mn (25)

Step-by-step solution

For d -block elements, oxidation state =n s electrons +(n-1) d electrons (unpaired) (a) Mn (25)=[ Ar ] 3 d⁵ 4 s² O. S .=5+2=7 (b) Cr (24)=[ Ar ] 3 d⁵ 4 s¹ O. S. =5+1=6 (c) Cu (29)=[ Ar ] 3 d¹⁰ 4 s¹ O. S. =0+1=1 (d) Fe (26)=[ Ar ] 3 d⁶ 4 s² O.S. =+2 and +3 Thus, only Mn exhibits +7 oxidation state among the given elements.

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