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10th Class Science Periodic Classification of Elements Question Bank Periodic Classification of Elements

  • question_answer
    An element R belongs to group XV of the periodic table. The formula of oxide of this element will be:

    A) \[{{R}_{2}}O\]                         

    B) \[RO\]

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

    D)        \[{{R}_{2}}{{O}_{5}}\]

    E) None of these

    Correct Answer: D

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