According to these reactions:
1) Here we have a REDOX reaction because we can see how the charge of Li goes from 0 on the left to +1 on the right. This says that Li has been oxidized. So, O is the one that is reduced.
REDOX reaction
2) This is a reaction of precipitation, PbI2 is a solid that appears as a precipitate.
Precipitation reaction
3) This is a reaction between an acid (HNO3) and a base (LiOH).
Acid/base reaction
