A-LevelChemistryChemical periodicity9701/12 · Oct/Nov 2016 · Q141 Mark

Elements Y and Z are both in Period 3. When the chloride of Y is added to water, it reacts and a solution of pH 2 is produced. When the chloride of Z is added to water, it dissolves and a solution of pH 7 is produced. Which statement explains these observations?

ABoth chlorides hydrolyse in water.

BY is magnesium and Z is sodium.

CY is phosphorus and Z is aluminium.

DY is silicon and Z is sodium.

✓ Correct answer

D: Y is silicon and Z is sodium.

Oracle Prep sorts past-paper questions by topic, so you can drill Chemical periodicity and see which topics are most likely to come up next.

Topic: Chemical periodicity, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Oct/Nov 2016 Paper 1 Variant 2, question 14.

Questions and mark schemes are from past examination papers and remain the copyright of the exam board. How Oracle Prep builds its content