Two metals that will displace hydrogen from dilute acids are zinc (Zn) and iron (Fe). Two metals that will not displace hydrogen from dilute acids are copper (Cu) and silver (Ag).
Explanation:
The ability of a metal to displace hydrogen from an acid depends on its reactivity. More reactive metals, like zinc and iron, are able to displace hydrogen from acids because they have a stronger tendency to lose electrons than hydrogen does.
Less reactive metals, like copper and silver, are located lower in the reactivity series. They do not have a strong enough tendency to lose electrons to displace hydrogen from acids