Đáp án:

Giải thích các bước giải:

 Câu `3 :`

`SO_3 : ` Sulfur trioxide

`Cr_2O_3` : Chromi (III ) oxide

`CuO : ` Copper (II) oxide

Câu 4 : ` 

Base 

`KOH : ` Potassium hydroxide

`NaOH : ` Sodium hydroxide

`Ca(OH)_2 : ` Calcium hydroxide

`Mg(OH)_2 : ` Magnessium hydroxide

Acid

`HNO_3 : ` : Acid nitric

`HCl : `Hydro chloride

`H_3PO_4 : ` Acid phosphoric

`H_2SO_4 : ` Sulfuric acide

Muối

`NaCl : ` Sodium chloride

`CuSO_4 : ` Copper sulfate

`Na_3PO_4 : ` Trisodium phosphaste

`K_2SO_4 : ` Potassium sulfate

`AgNO_3 : ` Silver nitrate

`BaSO_4 : ` Barium sulfate

`Fe_2O_3 : `Iron (III) oxide.

Muối acid

`NaHCO_3 : ` Sodium hydrocarbonate

`NaHSO_4 : ` Sodium hydrosulfate

`Ca(HCO_3)_2 : ` Calcium hydrocarbonate

Oxide : 

`MgO : ` Magnessium oxide

`Fe_2O_3 : `Iron (III) oxide.