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1) Na2SO3+K2Cr2O7+H2SO4=Na2SO4+Cr2(SO4)3+K2SO4+H2O
2)I2+H2O=HIO3+HI
3)MnSO4+PbO2+HNO3=HMnO4+Pb(NO3)2+PbSO4+H2O
4) KCIO3=KCI+O2
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