Chemistry · May / June 2019 · Paper 12 · Question 20

Reduction can be defined in terms of the gain or loss of oxygen or of hydrogen or of electrons. Which row correctly describes all three definitions of reduction?

1. Aoxygen gain, hydrogen loss, electrons loss
2. Boxygen gain, hydrogen loss, electrons gain
3. Coxygen loss, hydrogen loss, electrons loss
4. Doxygen loss, hydrogen gain, electrons gain

As printed in the paper