DP Chemistry (last assessment 2024)

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Question 22N.1.sl.TZ0.18

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Date November 2022 Marks available [Maximum mark: 1] Reference code 22N.1.sl.TZ0.18
Level sl Paper 1 Time zone TZ0
Command term Identify Question number 18 Adapted from N/A
18.
[Maximum mark: 1]
22N.1.sl.TZ0.18

The exothermic reaction I2 (g) + 3Cl2 (g) ⇌ 2ICl3 (g) is at equilibrium in a fixed volume. What is correct about the reaction quotient, Q, and shift in position of equilibrium the instant temperature is raised?


A.   Q > K, equilibrium shifts right towards products.

B.   Q > K, equilibrium shifts left towards reactants.

C.   Q < K, equilibrium shifts right towards products.

D.   Q < K, equilibrium shifts left towards reactants.

[1]

Markscheme

B

Examiners report

This question required thinking and reflection. The majority of candidates deduced correctly that the exothermic reaction would shift to the left when the temperature was increased, however, the relationship between Q and K was confusing. Only 37% of the candidates deduced that Q must be larger than the new K at the higher temperature in order for the reaction to shift to the left. The question did not discriminate well between high-scoring and low-scoring candidates.

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