A-LevelChemistryChemical periodicity9701/12 · May/June 2024 · Q201 Mark

Sodium is added to water to form solution Y. The pH of solution Y is measured. When powdered substance X is added to solution Y, the pH falls. Which two compounds could each be substance X?

AMgCl2 and Al(OH)3

BMgCl2 and K2O

CNaCl and Al(OH)3

DNaCl and K2O

✓ Correct answer

A: MgCl2 and Al(OH)3

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, May/June 2024 Paper 1 Variant 2, question 20.

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

X, Y and Z are three elements in the third period. • X reacts with chlorine to give a liquid product. • Y reacts with…

Complete the electronic configuration of a chromium atom. 1s²2s²2p⁶3s²

A solid Period 3 element, Q, is reacted with oxygen gas. Compound R is formed. When R is added to water the pH decrea…

Poly(ethene) and PVC are examples of addition polymers. Which statements are correct? 1 On combustion, PVC can produc…

Organic compound X gives a precipitate when warmed with aqueous silver nitrate. This precipitate dissolves when conce…

Propanal reacts with hydrogen cyanide to form 2-hydroxybutanenitrile. A suitable catalyst for this reaction is sodium…