DP Chemistry (last assessment 2024)

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Question 22N.2.sl.TZ0.5b

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Date November 2022 Marks available [Maximum mark: 1] Reference code 22N.2.sl.TZ0.5b
Level sl Paper 2 Time zone TZ0
Command term State, Write Question number b Adapted from N/A
b.
[Maximum mark: 1]
22N.2.sl.TZ0.5b

Lignite, a type of coal, contains about 0.40 % sulfur by mass.

(b)

Write an equation that shows how sulfur dioxide can produce acid rain.

[1]

Markscheme

SO2 (g) + H2O (l) → H2SO3 (aq)

OR

SO2 (g) + ½O2 (g) → SO3 (g)  AND  SO3 (g) + H2O (l) → H2SO4 (aq)

OR

SO2 (g) + ½O2 (g) + H2O (l) → H2SO4 (aq) ✔

 

Accept ionized forms of acids.

Examiners report

This question was poorly answered and only 30% of the candidates wrote a correct equation for the formation of acid rain from SO2. Mistakes included unbalanced equations and hydrogen added as a product.

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