What main change occurs when baking soda is heated?
Answer and explanation
Correct answer: Sodium carbonate, water and carbon dioxide are formed
Baking soda is sodium hydrogen carbonate, NaHCO₃. On heating, it undergoes thermal decomposition: 2NaHCO₃ → Na₂CO₃ + H₂O + CO₂. Thus sodium carbonate, water, and carbon dioxide are formed, making option A correct. The reaction does not produce sodium metal, oxygen, or only hydrogen, and the substance does not remain unchanged.
Frequently asked questions
What is the correct answer to this question?
Sodium carbonate, water and carbon dioxide are formed
Why is this the correct answer?
Baking soda is sodium hydrogen carbonate, NaHCO₃. On heating, it undergoes thermal decomposition: 2NaHCO₃ → Na₂CO₃ + H₂O + CO₂. Thus sodium carbonate, water, and carbon dioxide are formed, making option A correct. The reaction does not produce sodium metal, oxygen, or only hydrogen, and the substance does not remain unchanged.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Acids, Bases, and Salts.
