A-LevelChemistryEquilibria9701/12 · Oct/Nov 2017 · Q91 Mark
Nitrogen dioxide, NO2, is a brown gas. Dinitrogen tetroxide, N2O4, is a colourless gas. An equilibrium is established between NO2 and N2O4 in a closed vessel. 2NO2(g) (brown) ⇌ N2O4(g) (colourless) ∆H = −57 kJ mol⁻¹ Which row describes the effects of changing conditions on the colour of an equilibrium mixture of NO2 and N2O4?
Aincreasing the pressure: colour becomes darker, increasing the temperature: colour becomes darker
Bincreasing the pressure: colour becomes darker, increasing the temperature: colour becomes lighter
Cincreasing the pressure: colour becomes lighter, increasing the temperature: colour becomes darker
Dincreasing the pressure: colour becomes lighter, increasing the temperature: colour becomes lighter
✓ Correct answer
C: increasing the pressure: colour becomes lighter, increasing the temperature: colour becomes darker
Practise more questions on this topic
Oracle Prep sorts past-paper questions by topic, so you can drill Equilibria and see which topics are most likely to come up next.
Sign up free →