DP Chemistry (last assessment 2024)

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Question 22N.1.hl.TZ0.22

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

For the reaction I2 (g) + 3Cl2 (g) ⇌ 2ICl3 (g) at a certain temperature, the equilibrium concentrations are (in mol dm−3):

[I2] = 0.20, [Cl2] = 0.20, [ICl3] = 2.0

What is the value of Kc?


A.  0.25

B.  50

C.  2500

D.  5000

[1]

Markscheme

C

Examiners report

Over 72% of the candidates were able to calculate value of Kc from the concentrations given, with the other distractors being about equally favoured. Some teachers expressed concern at candidates having to do this without a calculator, but the figures were quite easy to manipulate and the number answering correctly indicates it did not hinder many candidates.

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