Ответ: 1) S + O2 = SO22) SO2 + 2NaOH = Na2SO3 + H2OSO2 + 2Na[+] + 2OH[-] = 2Na[+] + SO3[2-] + H2OSO2 +  2OH[-] =  SO3[2-] + H2O3)Na2SO3 + BaCl2 = BaSO3 + 2NaCl2Na[+] + SO3[2-] + Ba[2+] + 2Cl[-] = BaSO3 + 2Na[+] + 2Cl[-]Ba[2+] + SO3[2-] = BaSO34) BaSo3 = BaO + SO2