CAIE A-Level Chemistry AS 7.1.4 Expressions for Equilibrium Constants Questions

Practise constructing equilibrium-constant expressions from balanced equations and determining their units using CAIE 9701 AS questions.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • Construct expressions for equilibrium constants Kc and state their units.

CAIE A-Level Chemistry AS 7.1.4 Expressions for Equilibrium Constants Questions question 1

[Maximum number: 1]

The units of KcK_{\mathrm{c}} for an equilibrium reaction are mol1dm3\mathrm{mol}^{-1} \mathrm{dm}^{3}.
What could be the equation for the equilibrium?

1 A(aq)+B(aq)C(s)+D(aq)\mathrm{~A}(\mathrm{aq})+\mathrm{B}(\mathrm{aq}) \rightleftharpoons \mathrm{C}(\mathrm{s})+\mathrm{D}(\mathrm{aq})
2 P(aq)+Q(aq)R(aq)\mathrm{P}(\mathrm{aq})+\mathrm{Q}(\mathrm{aq}) \rightleftharpoons \mathrm{R}(\mathrm{aq})
3  W(aq)+2X(aq)Y(aq)+Z(aq)\mathrm{~W}(\mathrm{aq})+2 \mathrm{X}(\mathrm{aq}) \rightleftharpoons \mathrm{Y}(\mathrm{aq})+\mathrm{Z}(\mathrm{aq})

A

1, 2 and 3 are correct

B

1 and 2 only are correct

C

2 and 3 only are correct

D

1 only is correct

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