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Which property of an oxide changes from basic to acidic across period 3?
AAtomic number of the element
BBoiling point of the oxide
CAcid-base character of the oxide
DDensity of the oxide
Answer & Solution
Correct answer: C. Acid-base character of the oxide
1. Period 3 starts with metals like Na and Mg on the left.
2. Metal oxides such as Na₂O and MgO are basic in nature.
3. The middle element Al gives Al₂O₃, an amphoteric oxide.
4. Non-metal oxides on the right such as P₂O₅, SO₃ and Cl₂O₇ are acidic.
5. So the acid-base character of the oxide changes from basic to acidic.
6. The change reflects falling metallic character across the period.
_Source: Selina Concise Chemistry ICSE Class 10, Ch 1 'Periodic Table' (aplustopper.com extract)_
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