A-LevelChemistryNitrogen and sulfur9701/12 · Oct/Nov 2022 · Q231 Mark

R is a solid. R fizzes when hydrochloric acid is added. R reacts with hot aqueous sodium hydroxide, giving off a gas which turns red litmus blue. What is the formula of R?

ANH4CO3

B(NH4)2CO3

C(NH4)2HCO3

D(NH4)2SO4

✓ Correct answer

B: (NH4)2CO3

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, Oct/Nov 2022 Paper 1 Variant 2, question 23.

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

Four atmospheric pollutants are listed. 1 nitrogen oxides 2 carbon monoxide 3 unburnt hydrocarbons 4 sulfur dioxide W…

Gas M is produced when NH4Cl(aq) is heated with CaO(s). Which row is correct?

In a car engine, non-metallic element X forms a pollutant oxide Y. Further oxidation of Y to Z occurs in the atmosphe…

River water in an agricultural area contains NH4⁺, CO3²⁻, HCO3⁻, Cl⁻ and NO3⁻ ions. This water is treated by adding a…

Two nitrates decompose on heating according to the equations shown. 2Pb(NO3)2(s) → 2PbO(s) + 4NO2(g) + O2(g) 2NH4NO3(…

Organic compound X has the empirical formula C2H4O. Compound X is reduced by LiAlH4, but not by NaBH4. What is compou…