3 SO2 + Zn2 = Zn OSO2 + Zn S2O3 + Z03 . 4 ( Naz S203 5 H20 ) = 20 H20 + 3 ( Na2 SO4 ) + ... CS2 + 2 NH3 = H2S + NH3 HCNS . K2CS3 + 2 HCl = H2CS3 + 2 KCl .
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