The gas evolved on heating calcium carbonate turns lime water milky. Which gaseous product does this confirm?
Answer and explanation
Correct answer: Carbon dioxide
Calcium carbonate undergoes thermal decomposition: \(\mathrm{CaCO_3 \xrightarrow{\Delta} CaO + CO_2}\). The \(\mathrm{CO_2}\) produced reacts with lime water, \(\mathrm{Ca(OH)_2}\), to form an insoluble white precipitate of \(\mathrm{CaCO_3}\), making the solution milky. Hydrogen, nitrogen, and oxygen do not produce this milkiness.
Frequently asked questions
What is the correct answer to this question?
Carbon dioxide
Why is this the correct answer?
Calcium carbonate undergoes thermal decomposition: \(\mathrm{CaCO_3 \xrightarrow{\Delta} CaO + CO_2}\). The \(\mathrm{CO_2}\) produced reacts with lime water, \(\mathrm{Ca(OH)_2}\), to form an insoluble white precipitate of \(\mathrm{CaCO_3}\), making the solution milky. Hydrogen, nitrogen, and oxygen do not produce this milkiness.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Chemical Reactions and Equations.
