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Cr na. Cr2o7 2- +h^+/CR^3+. Cr2o7 2- cr3+ полуреакция. Cr2o7 2- cr3+. CR+o2 =cr2o7.
Cr2o7 2- +h^+/CR^3+. Cr2o7 2- cr3+ полуреакция. Cr2o7 2- cr3+. CR+o2 =cr2o7.

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