A-LevelChemistryChemical periodicity9701/12 · Feb/Mar 2024 · Q171 Mark

Element X is in Period 3. Element X reacts with oxygen to produce a solid, Y. When solid Y is added to water, a solution with a pH of less than 7 is produced. What is the identity of element X?

Asodium

Bsilicon

Cphosphorus

Dsulfur

✓ Correct answer

C: phosphorus

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Topic: Chemical periodicity, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Feb/Mar 2024 Paper 1 Variant 2, question 17.

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