Match each oxygen species or oxide listed on the left with its characteristic chemical pro… — JAMB UTME

Match each oxygen species or oxide listed on the left with its characteristic chemical property or reaction behavior on the right.

Dichlorine heptoxide ( $\text{Cl}_2\text{O}_7$ )Acidic oxide that reacts with water to yield perchloric acid ( $\text{HClO}_7$ is not formed, but $\text{HClO}_4$ is produced)
Dinitrogen monoxide ( $\text{N}_2\text{O}$ )Neutral oxide that decomposes on heating to re-ignite a glowing splint
Sodium peroxide ( $\text{Na}_2\text{O}_2$ )Peroxide that reacts with cold dilute acid to liberate hydrogen peroxide
Ozone ( $\text{O}_3$ )Triatomic allotrope of oxygen that turns moist potassium iodide-starch paper blue

Answer

Dichlorine heptoxide matches with the acidic oxide yielding perchloric acid; Dinitrogen monoxide matches with the neutral oxide that decomposes to re-ignite a glowing splint; Sodium peroxide matches with the peroxide liberating hydrogen peroxide with cold dilute acid; Ozone matches with the triatomic allotrope turning moist KI-starch paper blue.

Each pair correctly aligns the oxide/allotrope with its fundamental structural class and laboratory reaction. Dichlorine heptoxide is an acid anhydride for perchloric acid; dinitrogen monoxide is a neutral oxide that thermally decomposes to support combustion; sodium peroxide yields hydrogen peroxide with cold dilute acid; and ozone is an allotrope of oxygen that oxidizes iodide to iodine, turning potassium iodide-starch paper blue.

Step-by-Step Solution

Analyze Dichlorine heptoxide (

\text{Cl}_2\text{O}_7

)

Highest oxide of chlorine with oxidation state +7. Dissolves in water according to

\text{Cl}_2\text{O}_7 + \text{H}_2\text{O} \rightarrow 2\text{HClO}_4

, making it the acid anhydride of perchloric acid.

Classification of non-metal higher oxides as acid anhydrides.

Analyze Dinitrogen monoxide (

\text{N}_2\text{O}

)

Neutral oxide that does not react with acids or bases. Upon thermal decomposition,

2\text{N}_2\text{O} \rightarrow 2\text{N}_2 + \text{O}_2

, supplying enough oxygen gas to support combustion and rekindle a glowing splint.

Properties of neutral oxides of nitrogen.

Analyze Sodium peroxide (

\text{Na}_2\text{O}_2

)

Contains the peroxide linkage

\text{O}_2^{2-}

. Reacts with cold dilute acids according to

\text{Na}_2\text{O}_2 + \text{H}_2\text{SO}_4 \rightarrow \text{Na}_2\text{SO}_4 + \text{H}_2\text{O}_2

Distinct chemical behavior of metallic peroxides versus normal oxides or dioxides.

Analyze Ozone (

\text{O}_3

)

Strong oxidizing allotrope of oxygen. Oxidizes

\text{I}^-

\text{I}_2

according to

\text{O}_3 + 2\text{KI} + \text{H}_2\text{O} \rightarrow \text{O}_2 + 2\text{KOH} + \text{I}_2

, turning starch paper blue.

Standard qualitative laboratory test for ozone gas.

Key Concept

Classification of oxides (acidic, neutral, peroxide) and chemical characterization of oxygen allotropes.

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