question_answer 45)

    One of the constituents of baking powder is sodium hydrogen carbonate, the other constituent is                 (a) hydrochloric acid       (b) tartaric acid                  (c) acetic acid                     (d) sulphuric acid       

Answer:

  (b) Baking powder is a mixture of baking soda NaHCO3,(sodium hydrogen carbonate)and a mild edible acid such as tartaric acid. When baking powder mixes with water (form a king cake or bread), sodium hydrogen carbonate reacts with tartaric acid to evolve carbon dioxide gas.