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9th Class Science Atoms and Molecules Question Bank Atoms and Molecules

  • question_answer
    Which of the following statements are incorrect?
    I. Phosphate ion is a trivalent and positive ion.
    II. Calcium ion is trivalent and positive.
    Ill. Phosphorus is a polyatomic molecule.
    IV. Aluminium ion is divalent and positive.

    A) I and II            

    B) III and IV         

    C)        I, II and IV       

    D)        I, II and III       

    Correct Answer: C

    Solution :

    Phosphate ion \[\text{-PO}_{4}^{3-}\] Calcium ion \[\text{-C}{{\text{a}}^{\text{2+}}}\], Aluminium ion \[\text{-A}{{\text{l}}^{\text{3+}}}\]


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