KNO3 + FeCl2 + … → NO + FeCl3 +… + …
MnO2 + … + 2H2SO4 конц= К2SO4+ …+… + Br2
NaNO2 + … + H2SO4 → … + Cr2(SO4)3 + … + …
Na2SO3 + … + K2Cr2O7 = Na2SO4 + … + … + …
KNO3 + … + Cr2O3 → K2CrO4 + KNO2 + …
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