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Ответ:

Объяснение:

1.

4K + O2 = 2K2O

K2O + H2O = 2KOH

KOH + HCl = KCl + H2O

2.

S + O2 = SO2

2SO2 + O2 = 2SO3

SO3 + H2O = H2SO4

H2SO4 + 2KOH = K2SO4 + 2H2O

3.

2Al + 3H2SO4 = Al2(SO4)2 + 3H2↑

Al2(SO4)3 + 3BaCl2 = 3BaSO4↓ + 2AlCl3

AlCl3 + 3NaOH = Al(OH)3↓ + 3NaCl