GKFix MCQ Question

In the absorption step, SO3(g) + H2SO4(l) → H2S2O7(l), what happens to the oxidation state of sulphur?

• A. It increases from +4 to +6
• B. It decreases from +6 to +4
• C. It remains the same (+6)
• D. It alternates between +4 and +6