DP Chemistry (last assessment 2024)

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Question 22M.2.sl.TZ1.d(ii)

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Date May 2022 Marks available [Maximum mark: 1] Reference code 22M.2.sl.TZ1.d(ii)
Level sl Paper 2 Time zone TZ1
Command term Determine Question number d(ii) Adapted from N/A
d(ii).
[Maximum mark: 1]
22M.2.sl.TZ1.d(ii)

When heated in air, magnesium ribbon reacts with oxygen to form magnesium oxide.

The presence of magnesium nitride can be demonstrated by adding water to the product. It is hydrolysed to form magnesium hydroxide and ammonia.

Determine the oxidation state of nitrogen in Mg3N2 and in NH3.

[1]

Markscheme

Mg3N2: -3
AND
NH3: -3 ✔


Do not accept 3 or 3-

Examiners report

About 40% of students managed to correctly determine both the oxidation states, as -3, with errors being about equally divided between the two compounds.

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