Question

lead does not liberate hydrogen from dilute acids. give reason

Answer 1

Because it is below hydrogen in reactivity series so it can't displace hydrogen.

Answer 2

A more reactive element can displace a less reactive element from its salt solution. The metals above hydrogen in the activity series react with dilute sulphuric acid and dilute hydrochloric acid to liberate hydrogen. The metals below hydrogen in the activity series cannot do that.