The bulb glows in the presence of acids because the acidic solution allows the flow of electric current by carrying ions.

The activity aims to investigate whether all compounds containing hydrogen are acidic.

The common observation when acids react with metals is the generation of hydrogen gas, as acids donate protons to metals, resulting in the release of hydrogen gas.

The reaction of nonmetallic oxides with bases suggests that they are acidic in nature, similar to the behavior of acids when reacting with bases.

Nonmetallic oxides behave as acidic compounds, as they react with bases to form salts and water, analogous to the reaction of acids with bases.