81. Solving a chemistry problem

3 test

1. Which of the redox reactions is a disproportionation reaction?

e) SKOH → K2S K2SO4
2. What multipliers should be put to the oxidizing atom and reducing atom in the electronic balance scheme for the reaction:
Ba H2SO4 → BaSO4 H2S 4H2O
3. What chemical compound is an oxidizing agent in the reaction:
HNO2 H2S → S NO H2O
4. Arrange the coefficients in the redox reaction equation:
K2Cr2O7 HBr → Br2 KBr CrBr3 H2O
And indicate their values ​​for the reducing agent and oxidizing agent.
5. What chemical compound is a reducing agent in the reaction:
NH3 SO2 → NO S H2O