When \( \mathrm{H}_{2} \mathrm{SO}_{3} \) is converted into \( \mathrm{H}_{2} \mathrm{SO}_{4} \)...

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When \( \mathrm{H}_{2} \mathrm{SO}_{3} \) is converted into \( \mathrm{H}_{2} \mathrm{SO}_{4} \) the change in the oxidation state of sulphur is from:
(A) 0 to \( +2 \)
(B) \( +4 \mathrm{to}+2 \)
(C) \( +2 t_{0}+4 \)
(D) \( +4 \) to \( +6 \)
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