Which of the following statements regarding baking soda (sodium hydrogen carbonate) is not correct? A. It is prepared industrially by the reaction of sodium chloride, ammonia, carbon dioxide, and water. B. On heating, baking soda releases carbon dioxide gas, which makes it useful in baking. C. Baking soda is used in antacids because it neutralizes excess stomach acid, forming only salt and water.

Correct option is D

The correct answer is (D) Only C

Explanation:
• Let us evaluate each statement given in the prompt.
• Statement A is Correct: Baking soda is manufactured industrially via the Solvay process, which uses brine (NaCl), ammonia (NH3), carbon dioxide (CO2), and water to precipitate sodium hydrogen carbonate.
• Statement B is Correct: When heated during baking, NaHCO3 undergoes thermal decomposition to produce sodium carbonate, water vapor, and crucially, CO2 gas. This CO2 gas gets trapped in the dough, causing cakes and breads to rise and become spongy.
• Statement C is Incorrect: While baking soda is indeed an antacid that neutralizes stomach acid (HCl), it does NOT form "only salt and water." The chemical reaction is: NaHCO3 + HCl -> NaCl + H2O + CO2. The release of CO2 gas in the stomach causes belching (burping), which is a signature effect of using baking soda as an antacid.
• Since the question asks for the "not correct" statement, only C is incorrect, making Option D the right answer.

Information Booster:
• Baking Powder vs Baking Soda: Baking powder is a mixture of baking soda and a mild edible acid (like tartaric acid). The acid is necessary to neutralize the bitter-tasting sodium carbonate produced when baking soda is heated alone.

Additional Knowledge:
• Options A, B, and C are incorrect choices because they misidentify the true/false nature of the statements provided.