Which solid substance is formed when sodium hydrogen carbonate is heated?
Answer and explanation
Correct answer: Sodium carbonate
The governing concept is thermal decomposition of sodium hydrogen carbonate, commonly called baking soda. On heating, the balanced change is 2NaHCO3 → Na2CO3 + CO2 + H2O. Carbon dioxide and water are released, while sodium carbonate remains as the solid product. Thus option C is correct; the calcium compounds and sodium chloride are not products of this decomposition.
Frequently asked questions
What is the correct answer to this question?
Sodium carbonate
Why is this the correct answer?
The governing concept is thermal decomposition of sodium hydrogen carbonate, commonly called baking soda. On heating, the balanced change is 2NaHCO3 → Na2CO3 + CO2 + H2O. Carbon dioxide and water are released, while sodium carbonate remains as the solid product. Thus option C is correct; the calcium compounds and sodium chloride are not products of this decomposition.
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.
