Baking soda is the common name of ____________.

The correct answer is option 3. Sodium bicarbonate.

Baking soda is the common name of sodium bicarbonate.

Baking soda, also known scientifically as sodium bicarbonate \((NaHCO_3)\), is a chemical compound commonly used in cooking and baking as a leavening agent. It reacts with acidic ingredients to produce carbon dioxide gas, which helps baked goods rise and become fluffy.