alleryAcross period 3, which element forms the most acidic oxide?
ASodium
BSulphur
CAluminium
DMagnesium
Answer & Solution
Correct answer: B. Sulphur
1. Period 3 starts with metals (Na, Mg, Al) and ends with non-metals.
2. Oxides go from basic to acidic across the period.
3. SO3 (the oxide of sulphur) is a strongly acidic oxide.
4. It dissolves in water to give H2SO4, a strong acid.
5. So sulphur forms the most acidic oxide of those listed.
6. Chlorine oxide is more acidic still but is not in the options.
_Source: syllabus Science Ch 5 'Periodic Classification of Elements'_
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