1)Fe+2HCl=FeCl₂+H₂↑
2)H₂SO₄+2NaOH=Na₂SO₄+2H₂O
3)Ba(NO₃)₂+Na₂SO₄=BaSO₄↓+2NaNO₃
4)AlCl₃+3KOH=Al(OH)₃↓+3KCl
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1)Fe+2HCl=FeCl₂+H₂↑
2)H₂SO₄+2NaOH=Na₂SO₄+2H₂O
3)Ba(NO₃)₂+Na₂SO₄=BaSO₄↓+2NaNO₃
4)AlCl₃+3KOH=Al(OH)₃↓+3KCl