All acids generate ________ gas on reacting with metals.

Acids react with metal carbonates to liberate _____ gas.

Some metal oxides react with acid as well as base to produce salt and water. They are known as amphoteric oxides. The examples of amphoteric oxides are

Which one of the following contains all Lewis acids?

The reaction between an acid and a base to give a salt and water is known as a ______________ reaction.

Which one of the following was the first mineral acid discovered ?