An amphoteric oxide that can be reduced by a basic gas is ZnO (zinc oxide).

Here's why:

* Amphoteric Oxide: ZnO exhibits both acidic and basic properties. It reacts with acids to form salts and water, and with strong bases to form zincates.

* Reduction by a Basic Gas: ZnO can be reduced by a basic gas like hydrogen gas (H₂) at high temperatures. The reaction proceeds as follows:

ZnO(s) + H₂(g) → Zn(s) + H₂O(g)

In this reaction, the hydrogen gas acts as a reducing agent, providing electrons to reduce ZnO to metallic zinc.

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