Question- Identify the single-displacement reactions among the following:
1) HI(aq) + NaOH(aq) --> H2O(l) + NaI(aq)
2) Pb(s) + 2 AgNO3(aq) --> Pb(NO3)2(aq) + 2 Ag(s)
3) 2 Al(s) + Fe2O3(s) --> Al2O3(s) + 2 Fe(l)
4) 2 Na(s) + O2(g) --> Na2O2(s)
1 and 2
1 and 4
2 and 3
1 only
2 only
Explain the each and every step in detail for help