$\text{Cu}\left(\text{s}\right)+2{\text{AgNO}}_{\text{3}}\left(\text{aq}\right)\to \text{Cu}{\left({\text{NO}}_{\text{3}}\right)}_{\text{2}}\left(\text{aq}\right)+2\text{Ag}\left(\text{s}\right)$

$\text{Zn}\left(\text{s}\right)+2\text{HC}l\left(\text{aq}\right)\to \text{ZnC}{l}_2\left(\text{aq}\right)+{\text{H}}_{\text{2}}\left(\text{g}\right)\uparrow$

These two reactions are :

Above two reactions are displacement reactions, because.

$\text{A}+\text{BC}\to \text{AC}+\text{B}$, more reqctive Cu, displace Ag and Zn displace ${\text{H}}_2$ from HCl.