CIE iGCSE Co-Ordinated Science C10.2 Air quality and climate Exam Style Questions Paper 2
Question
The equation for the reaction between sulfur dioxide and oxygen is shown.
$2SO_{2(g)}$ + $O_{2}(g)$ → $2SO_{3}(g)$
Which statements explain why the rate of this reaction increases at higher temperatures?
1 The molecules move closer together so they collide more frequently.
2 The molecules move more quickly so they collide more frequently.
3 The activation energy is decreased.
4 More colliding particles possess the activation energy.
(A) 1 and 3
(B) 1 and 4
(C) 2 and 3
(D) 2 and 4
▶️Answer/Explanation
Ans: D
Question
A sample of air is analyzed before and after it is used in an experiment.
The percentage composition of the air before and after the experiment is recorded.
Which process does not produce this change in the composition of the air?
(A) combustion of coal
(B) combustion of natural gas
(C) combustion of sulfur
(D) respiration
▶️Answer/Explanation
Ans: C
Question
Four equations are listed.
1. H2S2O7 + H2O → H2SO4 + SO3 + H2O
2. 2S + 3O2 → 2SO3
3. H2SO4 + SO3 → H2S2O7
4. 2SO2 + O2 → 2SO3
Which equations represent reactions that are involved in the Contact process?
(A) 1 and 2 (B) 1 and 3 (C) 2 and 4 (D) 3 and 4
▶️Answer/Explanation
Ans: D
Question
Which statements about the Haber process are correct?
1. The hydrogen used is obtained from the air.
2. The pressure used is about twice atmospheric pressure.
3. The catalyst used is iron.
4. The process takes place at a temperature of about 450 C.
(A) 1 and 2 (B) 1 and 4 (C) 2 and 3 (D) 3 and 4
▶️Answer/Explanation
Ans : D