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CAIE A-Level Chemistry AS 9.2.5 Reactions of the Chlorides Nacl Mgcl2 Al Questions

Practise writing equations and predicting observations and pH when NaCl, MgCl₂, AlCl₃, SiCl₄ and PCl₅ react with water using CAIE 9701 AS questions.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • Write equations for reactions of Period 3 chlorides with water and predict the observations and pH of the solutions formed.

CAIE A-Level Chemistry AS 9.2.5 Reactions of the Chlorides Nacl Mgcl2 Al Questions question 1

[Maximum number: 1]

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

A

Both chlorides hydrolyse in water.

B

Element Y is magnesium and element Z is sodium.

C

Element Y is phosphorus and element Z is aluminium.

D

Element Y is silicon and element Z is sodium.

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