Помогите с реакциями по химии. Окислительно-восстановительные изменения

1) H2S+SO2 --> S+H2O

2) SO2+KIO3+H2O --> H2SO4+KI

3)S+HI --> I2+H2S

4) Na2SO3+I2+NaOH--> Na2SO4+NaI+H2O
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