Home › TYS Solutions › O Level Chem › 2017 › P1 Q33

2017 O Level Chem P1 Q33 — Air / Catalytic Converters Solution

Air / Catalytic Converters 2017 O Level Pure Chemistry · Paper 1 · Q33

Question

Catalytic converters are used in the removal of harmful pollutants from exhaust gases. Which equations show reactions that are useful in removing such pollutants? 1 N₂(g) + O₂(g) → 2NO(g) 2 NO(g) + CO(g) → ½N₂(g) + CO₂(g) 3 NO(g) + ½O₂(g) → NO₂(g) 4 NO₂(g) + 2CO(g) → ½N₂(g) + 2CO₂(g)

A1 and 2 only
B1 and 3 only
C2 and 4 only
D3 and 4 only

Correct answer: C

Video Solution

Explanation

Answer: C. Equations 2 and 4 are useful because they convert the pollutants NO, \(\text{NO}_2\) and CO into harmless nitrogen and carbon dioxide.

Equations 1 and 3 create pollutants (NO and \(\text{NO}_2\)) rather than removing them. So 2 and 4 only.

Get the Sec 3 / Sec 4 recording package

Every O Level Pure Chemistry TYS MCQ solution video, plus full Sec 3 / Sec 4 topic recordings.