Chapter 5.3, Problem 5.11P

Classify each reaction as a single replacement or double replacement reaction.

1. ${\text{Ni(NO}}_{\text{3}}{\text{)}}_{\text{2}}\text{+ Mg}\to {\text{Ni + Mg(NO}}_{\text{3}}{\text{)}}_{\text{2}}$
2. 2 Kl + Sn(NO₃)₂ —. Sn1₂ + 2 KNO₃
3. $\text{KCN + HCl }\to \text{KCl + HCN}$
4. ${\text{6 Na + Al}}_{\text{2}}{\text{(SO4)}}_{\text{3}}\to {\text{3 Na}}_{\text{2}}{\text{SO}}_{\text{4}}\text{+ 2 Al}$