40. Solving a chemistry problem

MnS HNO3  Mn(NO3)2 S NO H2O
As HJO3 H2O  H3AsO4 HJ
H3BO3 NaOH  Na2B4O7 H2O

1. Which of the following reactions are exchange reactions and redox reactions?
2. For exchange reactions, arrange the coefficients by selection, and write the full and reduced ion-molecular equations.
3. For redox reactions, using the electron balance method, make electronic equations, indicate the processes of oxidation, reduction, reducing agent, oxidizing agent.