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Tham khảo :

$a,$

$K_2O+2HCl \to 2KCl+H_2O$

$MgO+2HCl \to MgCl_2+H_2O$

$Fe_2O_3+6HCl \to 2FeCl_3+3H_2O$

$ZnO+2HCl \to ZnCl_2+H_2O$

$Na_2O+2HCl \to 2KCl+H_2O$

$CaO+2HCl \to CaCl_2+H_2O$

$b,$

$K_2O+SO_2 \to K_2SO_3$

$Na_2O+SO_2 \to Na_2SO_3$

$CaO+SO_2 \to CaSO_3$

$c,$

$K_2O+H_2O \to 2KOH$

$Na_2O+H_2O \to 2NaOH$ 

$CaO+H_2O \to Ca(OH)_2$

$\rm a)\\K_2O+2HCl\xrightarrow[]{}2KCl+H_2O\\MgO+2HCl\xrightarrow[]{}MgCl_2+H_2O\\Fe_2O_3+6HCl\xrightarrow[]{}2FeCl_3+3H_2O\\ZnO+2HCl\xrightarrow[]{}ZnCl_2+H_2O\\Na_2O+2HCl\xrightarrow[]{}2NaCl+H_2O\\CaO+2HCl\xrightarrow[]{}CaCl_2+H_2O\\b)\\K_2O+SO_2\xrightarrow[]{}K_2SO_3\\Na_2O+SO_2\xrightarrow[]{}Na_2SO_3\\CaO+SO_2\xrightarrow[]{}CaSO_3\\c)\\K_2O+H_2O\xrightarrow[]{}2KOH\\Na_2O+H_2O\xrightarrow[]{}2NaOH\\CaO+H_2O\xrightarrow[]{}Ca(OH)_2$