The catalytic activity of transition elements is related to their

  • A
    variable oxidation states
  • B
    surface area
  • C
    complex formation ability
  • D
    All of the above

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Comment on the statement that elements of the first transition series possess many properties different from those of heavier transition elements.

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Ferrous ion changes to $X$ ion upon reacting with acidified hydrogen peroxide. The number of $d$-electrons present in $X$ and its magnetic moment (in $BM$) are,respectively:

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