DP Chemistry (last assessment 2024)

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Question 19M.1.hl.TZ2.8

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Date May 2019 Marks available [Maximum mark: 1] Reference code 19M.1.hl.TZ2.8
Level hl Paper 1 Time zone TZ2
Command term Question number 8 Adapted from N/A
8.
[Maximum mark: 1]
19M.1.hl.TZ2.8

What is the oxidation state of the metal ion and charge of the complex ion in [Co(NH3)4Cl2]Cl?

[1]

Markscheme

C

Examiners report

This was one of the most challenging questions on the paper and it discriminated well between high scoring and low scoring candidates. 57 % of the candidates were able to use the formula of the compound to deduce the oxidation state of the metal ion and the charge of the complex ion. The most commonly chosen distractor was B where the charge of the complex ion was correct but the charge of the metal ion was not. Some teachers commented that the question was challenging but reasonable.

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