Carbon: An Important Element — Science STD 9 — Question
Maharashtra BoardEnglish MediumSTD 9ScienceCarbon: An Important Element3 Marks
Question
Limewater turns milky when $CO_2$ is passed through it.
✓
Answer
Limewater traditionally means a weak solution of the alkali calcium hydroxide $Ca(OH)_2.$
When $CO_2$ is passed through limewater, it reacts with calcium hydroxide to form insoluble particulates (precipitate) of Calcium carbonate $(CaCO_3).$
Calcium carbonate is weak basic salt and this gives a milky white precipitate.
Hence, lime water turns milky when $CO_2$ gas is passed through it.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.