1 2Mg + o2 --> 2Mgo

Question

2 MgCo3 --> MgO + Co2
3 Co2 + Ca(OH)2 --> CaCo3 + h2O
4 Zn + 2HCl --> ZnCl2 + H2
5 2H2 + O2 ---> 2H2O
2 KI + Pb(NO3)2 --> 2KNO3 + PbI2

endothermic is absorbs energy.
exothermic is releases energy.

which of those reaction are endothermic?
which of those reaction are exothermic?