Question

Which of the following has least tendency toliberate $H_2$ from mineral acids?

• A. Cu
• B. Mn
• C. Ni
• D. Zn

Answer 1

Answer: (A)

Cu

Answer 2

The tendency to liberate hydrogen gas from mineral acids generally depends on the reactivity of the metal.

• Copper (Cu) has a low reactivity and thus has a relatively low tendency to liberate hydrogen gas from mineral acids.
• Manganese (Mn) and nickel (Ni) have higher reactivities compared to copper, so they have a higher tendency to liberate hydrogen gas.
• Zinc (Zn) is more reactive than copper and has a higher tendency to liberate hydrogen gas from mineral acids.

So, the correct option is (A): Cu