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Cr na. C o2 so2 ОВР. 2cr+3h2so4=cr2(so4)3+3h2. K2cr2o7 h20. K2cr207+h2o2.
C o2 so2 ОВР. 2cr+3h2so4=cr2(so4)3+3h2. K2cr2o7 h20. K2cr207+h2o2.

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