Which of the following oxides reacts with both dilute hydrochloric acid and aqueous sodium… — JAMB UTME

Which of the following oxides reacts with both dilute hydrochloric acid and aqueous sodium hydroxide to form salt and water?

Zinc oxide ( $\text{ZnO}$ )Answer
B
Calcium oxide ( $\text{CaO}$ )
C
Sulfur(IV) oxide ( $\text{SO}_2$ )
D
Carbon(II) oxide ( $\text{CO}$ )

Answer

Zinc oxide (

\text{ZnO}

) is the correct answer because it is an amphoteric oxide.

Zinc oxide (

\text{ZnO}

) is an amphoteric oxide. It exhibits both basic and acidic properties, reacting with acids like hydrochloric acid to form zinc chloride and with strong bases like sodium hydroxide to form sodium zincate.

Step-by-Step Solution

Classify the given oxides based on their acid-base behavior

Calcium oxide is basic, Sulfur(IV) oxide is acidic, Carbon(II) oxide is neutral, and Zinc oxide is amphoteric.

Amphoteric oxides exhibit dual properties, reacting with both acids and bases.

Identify the oxide that reacts with both dilute hydrochloric acid and sodium hydroxide

Zinc oxide reacts with

\text{HCl}

to form zinc chloride and water, and with

\text{NaOH}

to form sodium zincate and water.

Only amphoteric oxides (such as

\text{ZnO}

\text{Al}_2\text{O}_3

, and

\text{PbO}

) form salts with both acids and strong alkalis.

Key Concept

Classification of Oxides (Amphoteric Oxides)

Question

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