Question

Name the metals which do not displace hydrogen from acids

Answer 1

Acid:

1. An acid is a hydrogen-containing compound that gives hydronium ions $\left({\mathrm{H}}_3{\mathrm{O}}^{+}\right.$ or $\left.{\mathrm{H}}^{+}\left(aq\right)\right)$ when dissolved in water.
2. An acid reacts with most metals to form corresponding salt and hydrogen gas.
3. The metal placed below the hydrogen will not displace the hydrogen because they are less reactive than the hydrogen.
4. Example: 1. $\mathrm{Cu}+\mathrm{HCl}\to \mathrm{No}\mathrm{reaction}.$

2. $\mathrm{Ag}+\mathrm{HCl}\to \mathrm{No}\mathrm{reaction}.$

Hence, less reactive or noble metals like copper, silver, and gold do not displace hydrogen from acids.