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Organic Chemistry: Some Basic Principles and Techniques — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryOrganic Chemistry: Some Basic Principles and Techniques1 Mark
MCQ
In the detection of carbon, lime water turns milky due to the formation of :
  • A
    $ \mathrm{CaO} $
  • B
    $ \mathrm{Ca}(\mathrm{OH})_2 $
  • ✓
    $ \mathrm{CaCO}_3 $
  • D
    $ \mathrm{Ca}\left(\mathrm{HCO}_3\right)_2$
✓

Answer

Correct option: C.
$ \mathrm{CaCO}_3 $
Carbon dioxide passes through limewater, giving a milky solution.
This is due to the insoluble suspension of calcium carbonate formed :
$\mathrm{Ca}(\mathrm{OH})_2(\mathrm{aq})+\mathrm{CO}_2(\mathrm{~g}) \rightarrow \mathrm{CaCO}_3(\mathrm{~s})+\mathrm{H}_2 \mathrm{O}(\mathrm{l})$

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