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NEET2026Chemistry
Q.

Although +3 oxidation state is most common in lanthanoids, cerium still shows +4 oxidation state because :

  1. A

    After losing one more electron, it acquires 4f electronic configuration

  2. B

    Its nearest inert gas is Radon.

  3. C

    After losing one more electron, it acquires 4f electronic configuration

  4. D

    Its atomic number is 61

Solution

Cerium (Z = 58) has the electronic configuration . By losing four electrons (forming Ce), it attains the stable noble-gas configuration. This extra stability favours the +4 state for Ce.

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