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Question

A solution of a substance X is used for white washing. Name the substance X and write its formula. Write the reaction of the substance X named in above with water.


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Solution

Reaction of quicklime with water:

  • The substance which is used for white washing is Calcium oxide(CaO).
  • Calcium oxide when reacted with water produces Calcium hydroxide(Lime water).
  • This absorbs the Carbon dioxide present in the environment and produces Calcium carbonate.
  • This Calcium carbonate forms a hard coating on the walls.
  • The complete reaction is:

CaO(s)Calciumoxide+H2O(l)WaterCa(OH)2(aq)CalciumhydroxideCa(OH)2(aq)Calciumhydroxide+CO2(g)CarbondioxideCaCO3(s)Cacliumcarbonate+H2O(l)Water

Therefore, the substance X is Calcium oxide(CaO).


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