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Question

A popular metal X reacts with oxygen gas to give an amphoteric oxide. Identify the metal X. (amphoteric oxides show both acidic and basic behaviour).
X+O2Amphoteric Oxide
  1. Na (Sodium)
  2. C (Carbon)
  3. Al (Aluminium)
  4. K (Potassium)


Solution

The correct option is C Al (Aluminium)
Aluminium on reaction with Oxygen, forms Al2O3. This metal oxide shows both acidic as well as basic behaviour. Such metal oxides which react with both acids as well as bases to produce salts and water are known as amphoteric oxides.

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