Photos SO2 SO3 H2SO4 NA2SO4

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So2 so3 h2so4 na2so4. Cr2o72- cr3+. Cr2+ cr2o72-. Cr2o 2 – 7 + 14 h + + 6 e – = 2 CR 3+ + 7 h2o. 2cr+3 → cr2o72-.
Cr2o72- cr3+. Cr2+ cr2o72-. Cr2o 2 – 7 + 14 h + + 6 e – = 2 CR 3+ + 7 h2o. 2cr+3 → cr2o72-.

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