O-LevelChemistryAcids, Bases & Salts5070/11 · May/June 2021 · Q51 Mark

Gas X has the following properties. 1 colourless 2 no effect on either damp red or blue litmus papers 3 no effect on limewater 4 flammable What is gas X?

Aammonia

Bchlorine

Chydrogen

Doxygen

✓ Correct answer

C: hydrogen

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

Topic: Acids, Bases & Salts, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2021 Paper 1 Variant 1, question 5.

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

Which statement about aqueous sodium chloride is correct?

Which compound is insoluble in water?

The following statements about dilute sulfuric acid are all correct. 1 Addition of Universal Indicator shows that the…

The energy profile diagram for the reaction between hydrogen and chlorine is shown. What information about this react…

The following changes could be made to the conditions in the reaction between zinc and hydrochloric acid. 1 increase …

The equation shows what happens in a redox reaction between iron(II) chloride and chlorine gas. 2FeCl2 + Cl2 → 2FeCl3…