Practice question
Question
In the reaction As₂S₃ + 7H₂O₂ + 2H₂O → 2H₃AsO₄ + 3H₂SO₄, which element’s oxidation number increases the most?
Explanation
As (+3 in As₂S₃) to +5 in H₃AsO₄: change = +2. S (-2 in As₂S₃) to +6 in H₂SO₄: change = +8. S increases more.
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