Aluminum Amphoteric
Aluminum hydroxide exhibits amphoteric behavior because it:
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About This Question
- Subject
- chemistry
- Chapter
- p-block elements
- Topic
- aluminum amphoteric
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
Reacts with both acids and bases
- Definition: An amphoteric substance is one that can act as both an acid and a base.
- Reaction with Acid: Al(OH)3(s)+3H+(aq)→Al3+(aq)+3H2O(l). Here, it acts as a base.
- Reaction with Base: Al(OH)3(s)+OH−(aq)→[Al(OH)4]−(aq). Here, it acts as an acid (Lewis acid/Brønsted acid interaction) by forming the aluminate ion.
- Comparison: Boron hydroxide (boric acid) is purely acidic, while lower elements in the group form increasingly basic hydroxides.
This easy difficulty chemistry question is from the chapter p-block elements, covering the topic of aluminum amphoteric. It appeared in the 2025 exam.
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