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JEE Main20206 Sep 2020Morning ShiftChemistryd and f Block ElementsActual

The lanthanoid that does NOT show + 4 oxidation state is:

Options

  1. ADy
  2. BCe
  3. CEu
  4. DTb

Correct answer

C. Eu

Step-by-step solution

   Eu ( z = 63 ) = 4 F 7 6 s 2 Dy ( z = 66 ) = 4 F 10 6 s 2 Tb ( z = 65 ) = 4 F 9 6 s 2 Ce ( 58 ) = 4 F 1 5 d 1 6 s 2 Dy ,   Tb and   Ce show + 4 oxidation state while Eu do not show + 4   oxidation state.

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