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AFMC AFMC Solved Paper-2001

  • question_answer
    The amphoteric oxide is :

    A) \[Cr{{O}_{3}}\]                 

    B) \[Cr{{O}_{5}}\]

    C) \[C{{r}_{2}}{{O}_{3}}\]                  

    D) \[CrO\]

    Correct Answer: C

    Solution :

                     
    Compound Oxidation number of Cr Nature
    \[Cr{{O}_{3}}\] +6 acidic
    \[Cr{{O}_{5}}\] +10 acidic
    \[Cr{{O}_{3}}\] +3 almost amphoteric
    CrO +2 basic
    Compound of Cr with higher oxidation number are acidic with much lower oxidation number are acidic and compound with oxidation number in between them are amphoteric.


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