Question

compound A when dissolved in water give compound B which is used in whitewashing compound B react with CO2 to from a white precipitate of compound C identify the compound A,B and C also write the equation involved

Answer 1

The substance used in whitewashing and gives off heat when dissolved in water is calcium oxide (quick lime).Therefore, compound A is CaO.Compound B is calcium hydroxide and compound C is calcium carbonate.The reactions are as follows:

CaO + H2O → Ca(OH) 2 + heat

 (A)   (B)

Ca(OH)2 + CO2  →  CaCO3  +  H2O

  (B)   (C)

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Answer 2

The substance used in whitewashing and gives off heat when dissolved in water is calcium oxide (quick lime).Therefore, compound A is CaO.Compound B is calcium hydroxide and compound C is calcium carbonate.The reactions are as follows:

CaO + H2O → Ca(OH) 2 + heat

 (A)   (B)

Ca(OH)2 + CO2  →  CaCO3  +  H2O

 (B)   (C)

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