AP Chemistryeasymcq1 pt
What is the oxidation number of sulfur in SO₄²⁻?
A.+6
B.+4
C.−2
D.+2
Explanation
Core Concept
Sum to the ion charge: S + 4(−2) = −2, so S = +6. Sulfate holds sulfur in its highest common oxidation state.
Correct Answer
A+6
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