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Although +3 oxidation stae is thje chara...

Although +3 oxidation stae is thje characteristic oxidation state of lanthanoids but cerium shows +4 oxidation state also. Why ?

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`._(58) Ce= [Xe]^(54) 4f^(2) 5d^(0) 6s^(2) . Ce^(3+) = [Xe]^(54) 4f^(1) `. Further loss of one electron gives stable `4f^(0)` configuration. Hence, it shows `+4` oxidation state also.
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Although +3 oxidation state is the characteristic oxidation state of lanthanoids but cerium shows +4 oxidation state also. Why?

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Knowledge Check

  • The most characteristic oxidation state of lanthanide is

    A
    `+2`
    B
    `+3`
    C
    `+4`
    D
    `+6`

  • The most characteristic oxidation state of lanthanides is :

    A
    `+2`
    B
    `+3`
    C
    `+4`
    D
    None

  • Although +3 is the characteristic oxidation state for lanthanoids but cerium also shows +4 oxidation state because

    A
    it has variable ionisation enthalpy
    B
    it has a tendency to attain noble gas configuration
    C
    it has a tendency to attain `f^(0)` configuration
    D
    it resembles `Pb^(4+)`

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    Although +3 is the characteristic oxidation state for lanthanide yst cerium also shows +4 oxidation state because I. It has a tendency to attain noble gas configuration. II. It has variable ionisation enthalpy. III. It has a tendency to attain f^0 configuration. The correct option is

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