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Among the following oxides, which is the MOST acidic?
ACl₂O₇
BMgO
CAl₂O₃
DNa₂O
Answer & Solution
Correct answer: A. Cl₂O₇
1. Across period 3 the acid-base character of oxides shifts from basic to acidic.
2. Na₂O is a strong base because Na is highly metallic.
3. MgO is still basic, though less so than Na₂O.
4. Al₂O₃ is amphoteric, sitting at the borderline.
5. Non-metallic oxides such as SO₃ and Cl₂O₇ are clearly acidic.
6. Cl₂O₇ comes from the most electronegative element on this list.
7. So Cl₂O₇ is the most acidic of the four oxides.
_Source: Selina Concise Chemistry ICSE Class 10, Ch 1 'Periodic Table' (aplustopper.com extract)_
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