расставить коэффициенты методом электронного баланса
As + KMnO4 + H2SO4 = K2SO4 +H3AsO4 + MnSO4
KMnO4 + H2Se = SeO2 + MnO2 + H2O
HI + K2Cr2O7= KI + Crl3 + I2 +H2O
SO2 + Cl2 + H2O = HCI + H2SO4​
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