Question:
The nature of oxides of aluminium, boron and gallium are respectively
The nature of oxides of aluminium, boron and gallium are respectively
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For Group 13:
$\text{B}_2\text{O}_3$ is acidic.
$\text{Al}_2\text{O}_3$ and $\text{Ga}_2\text{O}_3$ are amphoteric.
$\text{In}_2\text{O}_3$ and $\text{Tl}_2\text{O}_3$ are basic.
$\text{B}_2\text{O}_3$ is acidic.
$\text{Al}_2\text{O}_3$ and $\text{Ga}_2\text{O}_3$ are amphoteric.
$\text{In}_2\text{O}_3$ and $\text{Tl}_2\text{O}_3$ are basic.
Updated On: Jul 22, 2026
- Acidic, amphoteric, basic
- Amphoteric, acidic, amphoteric
- Amphoteric, acidic, acidic
- Basic, acidic, amphoteric
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Question:
The question asks for the respective chemical nature (acidic, basic, or amphoteric) of the oxides of Group 13 elements: Aluminium, Boron, and Gallium.
Step 2: Key Formula or Approach:
The oxide acidity decreases (and basicity increases) down a group as the metallic character of the elements increases.
We recall the specific behaviors of Group 13 oxides: $\text{B}_2\text{O}_3$, $\text{Al}_2\text{O}_3$, and $\text{Ga}_2\text{O}_3$.
Step 3: Detailed Explanation:
• Boron oxide ($\text{B}_2\text{O}_3$):
Boron is a non-metal. Its oxide is acidic and reacts with water to form boric acid:
\[ \text{B}_2\text{O}_3 + 3\text{H}_2\text{O} \rightarrow 2\text{H}_3\text{BO}_3 \]
• Aluminium oxide ($\text{Al}_2\text{O}_3$):
Aluminium is a metalloid/weak metal. Its oxide is amphoteric, meaning it reacts with both strong acids and strong bases.
• Gallium oxide ($\text{Ga}_2\text{O}_3$):
Like alumina, Gallium oxide is also amphoteric in nature.
• Combining these: Aluminium oxide is amphoteric, Boron oxide is acidic, and Gallium oxide is amphoteric.
Step 4: Final Answer:
The nature of the oxides of aluminium, boron, and gallium are amphoteric, acidic, and amphoteric, respectively.
The question asks for the respective chemical nature (acidic, basic, or amphoteric) of the oxides of Group 13 elements: Aluminium, Boron, and Gallium.
Step 2: Key Formula or Approach:
The oxide acidity decreases (and basicity increases) down a group as the metallic character of the elements increases.
We recall the specific behaviors of Group 13 oxides: $\text{B}_2\text{O}_3$, $\text{Al}_2\text{O}_3$, and $\text{Ga}_2\text{O}_3$.
Step 3: Detailed Explanation:
• Boron oxide ($\text{B}_2\text{O}_3$):
Boron is a non-metal. Its oxide is acidic and reacts with water to form boric acid:
\[ \text{B}_2\text{O}_3 + 3\text{H}_2\text{O} \rightarrow 2\text{H}_3\text{BO}_3 \]
• Aluminium oxide ($\text{Al}_2\text{O}_3$):
Aluminium is a metalloid/weak metal. Its oxide is amphoteric, meaning it reacts with both strong acids and strong bases.
• Gallium oxide ($\text{Ga}_2\text{O}_3$):
Like alumina, Gallium oxide is also amphoteric in nature.
• Combining these: Aluminium oxide is amphoteric, Boron oxide is acidic, and Gallium oxide is amphoteric.
Step 4: Final Answer:
The nature of the oxides of aluminium, boron, and gallium are amphoteric, acidic, and amphoteric, respectively.
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