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Answer: 3. BeO

Acidic character of oxides falls as the metallic character of the element rises.

In group 2, MgO, CaO and BaO are basic (basicity increases down the group). Be is the smallest and the least metallic, and BeO is amphoteric, i.e. the most acidic here.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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