Practice question
Question
What is the oxidation number of iron in Fe₃(PO₄)2?
Explanation
Let Fe = x. PO₄³− has P (+5) and O (-2): +5 + 4(-2) = -3. For Fe₃(PO₄)2: 3x + 2(-3) = 0, 3x - 6 = 0, x = +2.
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