`SO_3:` Sulfur Trioxide `-` Acidic Oxide

`H_2SO_4:` Acid Sulfuric `-` Acid

`Fe(OH)_2:` Iron`(II)` Hydroxide `-` Base không tan

`BaCl_2:` Barium Chloride `-` Muối trung hòa

Đáp án:

SO3 $\to$ acidic oxide $-$ sulfur trioxide

H2SO4 $\to$ acid có nhiều nguyên tử oxygen $-$ sulfuric acid

Fe(OH)2 $\to$ base không tan trong nước $-$ iron(II) hydroxide

BaCl2 $\to$ muối trung hoà $-$ barium chloride.