DP Chemistry (last assessment 2024)

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Question 22N.1.hl.TZ0.23

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Date November 2022 Marks available [Maximum mark: 1] Reference code 22N.1.hl.TZ0.23
Level hl Paper 1 Time zone TZ0
Command term Apply Question number 23 Adapted from N/A
23.
[Maximum mark: 1]
22N.1.hl.TZ0.23

Which of these changes would shift the equilibrium to the right?

[Co(H2O)6]2+ (aq) + 4Cl− (aq) ⇌ [CoCl4]2− (aq) + 6H2O (l)

I.   Addition of 0.01 M HCl
II.  Addition of concentrated HCl
III. Evaporation of water


A.  I and II only

B.  I and III only

C.  II and III only

D.  I, II and III

[1]

Markscheme

C

Examiners report

This proved to be the most difficult question on the paper with <30% of candidates deducing which changes would shift the equilibrium to the right and success rate seemed to be only weakly related to overall performance. The most popular answer was (D), indicating that most students did not realise that adding dilute HCl would add much more water than Cl−.

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