Выберите реакции, которые НЕ осуществляются на практике:
1) Cu+2NaCl=2Na+CuCl2
2) Ba(OH3)2+K2SO4=2KNO3+BaSO4
3) K2CO3+CaCl2=2KCl+CaCO3
4) K2SO3+2HCl=2KCl+H2O+SO2
5) Zn(OH)2+2KCl=2KOH+ZnCl2
6) FeSO4+2KOH=K2SO4+Fe(OH)2
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