A-LevelChemistryNitrogen and sulfur9701/12 · May/June 2011 · Q361 Mark

In a car engine pollutant oxide Y, which contains non-metallic element X, is formed. Further oxidation of Y to Z occurs in the atmosphere. In this further oxidation, 1 mol of Y reacts with 0.5 mol of gaseous oxygen. X could be either nitrogen or sulfur. Which statements about X, Y and Z can be correct? 1 The oxidation number of X increases by two from Y to Z. 2 Y may have an unpaired electron in its molecule. 3 Y is a polar molecule.

A1, 2 and 3 are correct

B1 and 2 only are correct

C2 and 3 only are correct

D1 only is correct

✓ Correct answer

A: 1, 2 and 3 are correct

Oracle Prep sorts past-paper questions by topic, so you can drill Nitrogen and sulfur and see which topics are most likely to come up next.

Topic: Nitrogen and sulfur, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, May/June 2011 Paper 1 Variant 2, question 36.

Questions and mark schemes are from past examination papers and remain the copyright of the exam board. How Oracle Prep builds its content