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.
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Answer: I ,II,IV are incorrect
Explanation:
I. PO4^-3
II. Ca^2+
III. P4
IV. Al^3+
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