C: air
Oracle Prep sorts past-paper questions by topic, so you can drill Atomic Structure and see which topics are most likely to come up next.
Sign up free →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 both chlorine atoms and chloride ions is correct?
An atom, X, contains 16 protons. Which statement about X is correct?
An atom of which element gains three electrons when it forms an ion?
Aqueous copper(II) sulfate is electrolysed using copper electrodes. The current is constant and the anode (positive e…
In the extraction of aluminium by electrolysis, its oxide is dissolved in molten cryolite. Cryolite is a sodium salt.…
Which substance is not a raw material used in the manufacture of sulfuric acid?