Chemistry
Senior High
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(イ)の①でOの酸化数が-1→-2になる理由が分かりません。-1→0にはなりませんか?

酸1化剤…O 還元剤…R 酸化剤 (ア) 2。HeS + SO2 3S+ 2H2O 1 (イ)HO H2O2 +。SO2 2 → H2SO4 - (ウ) K2Cr2O7 + 4。H.SO』 + 3。H:O2 (5

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