1)закончите уравнение реакций
Ca+H2SO4=
K2O+HCl=
Fe2O3+HCl=
Na2S+HNO3=
2)Закончите возможные уравнения реакций
Na2SO3+H2SO4=
K2O+NaOH=
H3PO4+Ca(OH)2+
NaOH+SO3=
NaCl+Ba(OH)2=
напишите пожалуйста

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