Question

The metal which cannot displace hydrogen from acid is:

• A. iron
• B. copper
• C. sodium
• D. zinc

Answer 1

The correct option is B copper

In the reactivity series, the metals that come above hydrogen are more reactive than hydrogen and hence they have the ability to displace hydrogen. For example, Sodium$\left(Na\right)$, Iron$\left(Fe\right)$, Zinc$\left(Zn\right)$.

On the other hand, the metals that come below hydrogen in the reactivity series are less reactive than hydrogen and hence they cannot displace hydrogen. For eg, Copper$\left(Cu\right)$, Mercury$\left(Hg\right)$, Silver$\left(Ag\right)$, Gold$\left(Au\right)$.

Thus, the correct answer is option (B).