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A-LevelChemistryChemical periodicity9701/12 · Oct/Nov 2020 · Q191 Mark

Compound X is the oxide of a Period 3 element. Compound X reacts with water to give an acidic solution. A solution is prepared by reacting 0.100 g of compound X with an excess of water. This solution is neutralised by exactly 25.0 cm³ of 0.100 mol dm⁻³ sodium hydroxide solution. What could be the identity of compound X?

AAl₂O₃

BMgO

CP₄O₁₀

DSO₃

✓ Correct answer

D: SO₃

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About this question

Topic: Chemical periodicity, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Oct/Nov 2020 Paper 1 Variant 2, question 19.

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