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Question

Which gives CO2 on heating slaked lime or limestone?


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Solution

Slaked lime

  • The chemical formula of slaked lime is CaOH2.
  • Slaked lime (calcium hydroxide) gives Calcium oxide and water on heating.
  • The reaction is as follows:-
  • CaOH2aqCaOs+H2Ol

Limestone

  • The chemical formula of limestone is CaCO3
  • Limestone (calcium carbonate) gives Calcium oxide and carbon dioxide gas on heating.
  • The reaction is as follows:-
  • CaCO3sCaOs+CO2g
  • Hence, limestone gives CO2 on heating .

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