Which of the following is a precipitation reaction?
NaCl(aq) Lil(aq)->Nal(aq) LiCl(aq)
Zn(s) 2AgNO3(aq)->2Ag(s) Zn(NO3)2(aq)
HCl(aq) KOH(aq)->KCl(aq) H_(2)O(l)
2Lil(aq) Hg2(NO3)2(aq)->Hg212(s) 2LiNO3(aq)
None of the above are precipitation reactions.