Question

K-->KOH-->K2SO4-->KCl-->AgCl
Na2O-->NaOH-->Fe(OH)2-->Fe

Answer 1

1)4K+O₂=2K₂O
   K₂O+H₂O=2KOH
2)2KOH+H₂SO₄=K₂SO₄+2H₂O
3)K₂SO₄+2HCl=2KCl+H₂SO₄
4)KCl+AgNO₃=AgCl+KNO₃

1)Na₂O+H₂O=2NaOH
2)2NaOH+FeSO₄=Fe(OH)₂+Na₂SO₄
3)Fe(OH)₂=FeO+H₂O
   2FeO=2Fe+O₂