Which gas does baking soda give on reacting with an acid?
Answer and explanation
Correct answer: Carbon dioxide
Baking soda is sodium hydrogen carbonate, NaHCO₃. When it reacts with an acid, the hydrogen carbonate ion first forms carbonic acid, which quickly decomposes into water and carbon dioxide: NaHCO₃ + HCl → NaCl + H₂O + CO₂. Effervescence shows the gas release. The reaction does not produce hydrogen, chlorine, or oxygen, so option B is correct.
Frequently asked questions
What is the correct answer to this question?
Carbon dioxide
Why is this the correct answer?
Baking soda is sodium hydrogen carbonate, NaHCO₃. When it reacts with an acid, the hydrogen carbonate ion first forms carbonic acid, which quickly decomposes into water and carbon dioxide: NaHCO₃ + HCl → NaCl + H₂O + CO₂. Effervescence shows the gas release. The reaction does not produce hydrogen, chlorine, or oxygen, so option B is correct.
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.
