The gas produced on heating calcium carbonate is passed through lime water. The milkiness of lime water is caused by the formation of which substance?
Answer and explanation
Correct answer: Calcium carbonate d a d a a a a a a a a a a a a a ്
Heating calcium carbonate produces carbon dioxide:
\[\mathrm{CaCO_3 \xrightarrow{\Delta} CaO + CO_2}\]
The carbon dioxide reacts with calcium hydroxide in lime water to form an insoluble precipitate of calcium carbonate:
\[\mathrm{CO_2 + Ca(OH)_2 \rightarrow CaCO_3\downarrow + H_2O}\]
This insoluble calcium carbonate precipitate makes lime water appear milky. In contrast, passing excess carbon dioxide can form soluble calcium bicarbonate, causing the milkiness to decrease.
Frequently asked questions
What is the correct answer to this question?
Calcium carbonate
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Why is this the correct answer?
Heating calcium carbonate produces carbon dioxide:
\[\mathrm{CaCO_3 \xrightarrow{\Delta} CaO + CO_2}\]
The carbon dioxide reacts with calcium hydroxide in lime water to form an insoluble precipitate of calcium carbonate:
\[\mathrm{CO_2 + Ca(OH)_2 \rightarrow CaCO_3\downarrow + H_2O}\]
This insoluble calcium carbonate precipitate makes lime water appear milky. In contrast, passing excess carbon dioxide can form soluble calcium bicarbonate, causing the milkiness to decrease.
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.
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