Which of the items listed can be classified as an example of an base?

The items listed that can be classified as examples of a base are:

• Bleach
• Antacid tablet
• Cleaning products
• Soap

These items are known to have basic (alkaline) properties, while oranges and pickles are acidic. Carbonic acid is, as the name suggests, an acid, and a boy puckering his lips is not a chemical substance but a physical action.