DP Chemistry (last assessment 2024)

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Question 22M.2.sl.TZ2.d(i)

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Date May 2022 Marks available [Maximum mark: 1] Reference code 22M.2.sl.TZ2.d(i)
Level sl Paper 2 Time zone TZ2
Command term Draw Question number d(i) Adapted from N/A
d(i).
[Maximum mark: 1]
22M.2.sl.TZ2.d(i)

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−

Draw the Lewis structure of NO3−.

[1]

Markscheme

 

Do not accept the delocalised structure.

Accept any combination of dots, crosses and lines.

Coordinate/dative bond may be represented by an arrow.

Examiners report

Only 20% of the candidates scored the mark for the Lewis structure of NO3-. Mistakes included: missing charge, missing lone pairs, 3 single bonds, 2 double bonds.

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