Question

In the presence of an active metal, do bases usually release hydrogen gas?

Answer 1

On reacting with a active metal , bases generally do not release hydrogen gas

Explanation:

But there are some exceptions,
Such as when zinc reacts with sodium hydroxide,hydrogen gas is released with the formation of sodium zincate.
The reaction is given below,
Zn + 2NaOH --> `Na_2ZnO_2 + H_2`
Metals such as aluminium also give this reaction