Question

Which of the following are single replacement reactions? I think the 1,2,4 are single, right? Just wanna be sure.

NaHCO3(s) + HCl(aq) → NaCl(aq) + CO2(g) + H2O(l)


Zn(s) + 2 HC2H3O2(aq) → Zn(C2H3O2)2(aq) + H2(g)


N2(g) + 3 H2(g) → 2 NH3(g)

2 AgNO3(aq) + Cu(s) → 2 Ag(s) + Cu(NO3)2(aq)

Answer 1

I don't think 1 is single.