Which half-reaction from the notes is an example of reduction?
A$Zn \rightarrow Zn^{2+} + 2e^-$
B$Cu \rightarrow Cu^{2+} + 2e^-$
C$Cu^{2+} + 2e^- \rightarrow Cu$
D$Zn^{2+} \rightarrow Zn + 2e^-$
Answer & Solution
Correct answer: C. $Cu^{2+} + 2e^- \rightarrow Cu$
Reduction involves gain of electrons. In $Cu^{2+} + 2e^- \rightarrow Cu$, copper ions gain electrons to form copper metal, so this is the reduction half-reaction.
Related questions
Reduction, in the classical sense, is the reverse of:Oxidation number and oxidation state are terms that are:The classical definition of oxidation looked at oxygen and:Which is a redox reaction according to the electron transfer view?Magnesium and sulphur burning in oxygen illustrate oxidation by the definition that is:Redox reactions are involved in phenomena that are physical and also:In disproportionation, the element in the reacting substance is in a state that is:A substance undergoing disproportionation must contain an element with at least how many o