3. Write the equations for redox reactions using the half-reaction method. Indicate the oxidizing agent and reducing agent, the reaction of the medium. For what purposes can these reactions be used in qualitative analysis?
1) Bi2S3 HNO3 2) NaCl K2Cr2O7 H2SO4
3) Cr(NO3)3 (NH4)2S2O8 H2O 4) Zn Na2SO3 HCl
5) KI KMnO4 H2SO4

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