DP Chemistry (last assessment 2024)

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Question 22M.2.sl.TZ2.3d(ii)

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Date May 2022 Marks available [Maximum mark: 2] Reference code 22M.2.sl.TZ2.3d(ii)
Level sl Paper 2 Time zone TZ2
Command term Explain Question number d(ii) Adapted from N/A
d(ii).
[Maximum mark: 2]
22M.2.sl.TZ2.3d(ii)

Sulfur trioxide is produced from sulfur dioxide.

2SO2 (g) + O2 (g) ⇌ 2SO3 (g)          ΔH = −196 kJ mol−1

Nitric acid, HNO3, is another strong Brønsted–Lowry acid. Its conjugate base is the nitrate ion, NO3−

(d(ii))

Explain the electron domain geometry of NO3−.

[2]

Markscheme

three electron domains repel

OR

three electron domains as far away as possible ✔

 

trigonal planar

OR

«all» angles are 120° ✔

Examiners report

The majority of candidates deduced the correct electron domain geometry scoring the first mark including cases of ECF. Only a small number of candidates satisfied the requirements of the markscheme for the explanation.

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