Answer:
5.
i). d) is a redox reaction
ii). a), b) and e) are acid-base(proton transfer)
Explanation:
i).
A redox reaction is the change in charge of ions in a reaction(btw #4 d should be magnesium nitrate + Hydrogen instead of water). An easy way to identify a redox reaction is to look for Single Replacement reactions. All Simple Replacement Reactions are Redox. Since d) is the only single replacement, it is redox as the charge of the ions change.
ii).
In all the examples provided, there is an acid reacting with a base. They are not redox and therefore they are acid-base, as salt and water result from strong-acid/base reaction.