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During the thermal decomposition of calcium carbonate, the evolved gas is passed through lime water, which turns milky. This confirms the presence of which gas?

Answer and explanation

Correct answer: Carbon dioxide

The thermal decomposition reaction is \(\mathrm{CaCO_3 \xrightarrow{\Delta} CaO + CO_2}\). The evolved \(\mathrm{CO_2}\) reacts with lime water, \(\mathrm{Ca(OH)_2}\), to form an insoluble white precipitate of \(\mathrm{CaCO_3}\), making the lime water milky. Oxygen supports combustion, but it does not turn lime water milky.

Related tags

Chemical ReactionsThermal DecompositionCalcium CarbonateCarbon DioxideLime WaterClass 10 Science

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