AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
(B) A mild edible acid such as tartaric acid
Baking powder is a mixture of baking soda (NaHCO₃) and a mild edible acid such as tartaric acid.
The textbook explicitly states under Uses of Baking Soda: "baking powder is a mixture of baking soda (sodium hydrogencarbonate) and a mild edible acid such as tartaric acid." The acid reacts with NaHCO₃ on heating/mixing with water to release CO₂, making bread/cake soft and spongy. Do not confuse baking powder with washing soda or baking soda alone.
Source: Chapter 2, Section 2.4.3 (Uses of Baking Soda)