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Na co. Cr2o3 3co 2cr 3co. Cr2o3 co CR co2. Cr3+ h2so4. Na2co3 HNO конц.
Cr2o3 3co 2cr 3co. Cr2o3 co CR co2. Cr3+ h2so4. Na2co3 HNO конц.

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