Question

Помогитееееееееееее!

Answer 1

1. $\displaystyle BaO+SO_2 = BaSO_3$

2. $\displaystyle Al + H_2SO_4 = Al_2(SO_4)_3 + H_2$

3. $\displaystyle NaOH + HNO_3 = NaNO_3 + H_2O$

Ответ: 1е2г3а.