Balance (acidic sol'n) H₂S + UO₂⁺ --> S + U⁴⁺

Balance (acidic sol'n) Cr₂O₇^2- + H₂SO₃ --> Cr³⁺ + HSO₄^-

Balance (basic sol'n) MnO₄^- + NH₄OH --> NO₃^- + MnO₂

Balance (basic sol'n) CO(NH₂)₂ + OBr^- --> CO₂ + N₂ + Br^-

Balance (acidic sol'n) IO₃^- + I^- --> I₂

Answers:

6H⁺ + H₂S + 2UO₂⁺ --> S + 2U⁴⁺ + 4H₂O

Cr₂O₇^2- + 3H₂SO₃ + 5H⁺ --> 2Cr³⁺ + 3HSO₄^- + 4H₂O

8 MnO₄^- + 3NH₄OH --> 3NO₃^- + 8MnO₂+ 5OH^- + 5H₂O

CO(NH₂)₂ + 3OBr^- --> CO₂ + N₂ + 3Br^-+ 2H₂O

IO₃^- + 5I^- + 6H⁺ --> 3I₂ + 3H₂O