Name two metals which will displace hydrogen from dilute acids, and two metals which will not.

Metals that are higher in the reactivity series will displace hydrogen from dilute acids, while metals lower in the reactivity series will not. Here are two examples of each:

Metals that will displace hydrogen from dilute acids:

1. Zinc (Zn): Zinc is a moderately reactive metal and will readily displace hydrogen from dilute acids, such as hydrochloric acid (HCl) or sulfuric acid (H2SO4). The reaction produces zinc salts and hydrogen gas.

2. Magnesium (Mg): Magnesium is more reactive than zinc and will also displace hydrogen from dilute acids. It reacts with acids like hydrochloric acid (HCl) to form magnesium salts and hydrogen gas.

Metals that will not displace hydrogen from dilute acids:

1. Copper (Cu): Copper is a less reactive metal and will not displace hydrogen from dilute acids. It does not react with acids like hydrochloric acid or sulfuric acid under normal conditions.

2. Silver (Ag): Silver is even less reactive than copper and will not displace hydrogen from dilute acids. It does not react with dilute acids like hydrochloric acid or sulfuric acid.

The reactivity series of metals helps to predict their behavior when they come into contact with dilute acids. More reactive metals can displace hydrogen from acids, while less reactive metals cannot.