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Date	May 2019	Marks available	1	Reference code	19M.1.hl.TZ2.25
Level	HL	Paper	1	Time zone	TZ2
Command term		Question number	25	Adapted from	N/A

Question

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

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).

Syllabus sections

Core » Topic 8: Acids and bases » 8.5 Acid deposition

18M.2.sl.TZ1.5b:
Dissolved carbon dioxide causes unpolluted rain to have a pH of approximately 5, but other dissolved gases can result in a much lower pH. State one environmental effect of acid rain.
22M.2.sl.TZ2.3c(i): State the product formed from the reaction of SO3 with water.
18M.2.hl.TZ2.2e.i:
Formulate the equation for the reaction of nitrogen dioxide, NO₂, with water to form two acids.
16N.2.sl.TZ0.3b:
Suggest why the experiment should be carried out in a fume hood or in a well-ventilated laboratory.
18M.2.hl.TZ2.2e.ii:
Formulate the equation for the reaction of one of the acids produced in (e)(i) with calcium carbonate.
18N.3.sl.TZ0.1a: Outline why the initial reaction should be carried out under a fume hood.
18N.3.hl.TZ0.1a: Outline why the initial reaction should be carried out under a fume hood.
19M.1.sl.TZ1.20: Which is not a source of oxides of sulfur and nitrogen? A. burning coal B. internal...
19M.1.sl.TZ2.20:
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
17M.2.sl.TZ2.5c:
State the equation for the reaction of NO₂ in the atmosphere to produce acid deposition.
18M.2.hl.TZ1.5b:
Dissolved carbon dioxide causes unpolluted rain to have a pH of approximately 5, but other dissolved gases can result in a much lower pH. State one environmental effect of acid rain.
21M.2.hl.TZ1.1e(iii): Suggest why this process might raise environmental concerns.
21M.1.sl.TZ2.20: Which causes acid deposition? A. SO2 B. SiO2 C. SrO D. CO2
21M.2.sl.TZ2.1f:
Outline how one calcium compound in the lime cycle can reduce a problem caused by acid deposition.
21M.2.sl.TZ1.1d(iii): Suggest why this process might raise environmental concerns.
22M.2.hl.TZ2.6d(i):
State the product formed from the reaction of SO₃ with water.
20N.1.hl.TZ0.24:
Which of these oxides contribute to acid deposition?

I.   ${SO}_{2}$
II.   ${NO}_{2}$
III.   ${CO}_{2}$

A. I and II only

B. I and III only

C. II and III only

D. I, II and III
21M.2.hl.TZ2.1e:
Outline how one calcium compound in the lime cycle can reduce a problem caused by acid deposition.

Core » Topic 8: Acids and bases

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