DP Chemistry (first assessment 2025)

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Question 19M.1A.SL.TZ2.25

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Date May 2019 Marks available [Maximum mark: 1] Reference code 19M.1A.SL.TZ2.25
Level SL Paper 1A Time zone TZ2
Command term Question number 25 Adapted from N/A
25.
[Maximum mark: 1]
19M.1A.SL.TZ2.25

What is the major reason why the pH of unpolluted rain is less than 7?

A. methane

B. carbon dioxide

C. nitrogen oxides

D. sulfur dioxide

[1]

Markscheme

B

Examiners report

69 % of the candidates identified CO2 as the gas responsible for the acidity of unpolluted rain. The majority of the candidates that answered incorrectly chose nitrogen oxides (C) or sulfur dioxide (D).

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