The compound A on heating gives a colourless gas and a residue that is dissolved in water to obtain B. Excess of CO2 residue that is dissolved in water to obtain B. Excess of is recovered in the solid form. Solid C on gentle heating gives back A. The compound is 

  1. A

    CaSO42H2O

  2. B

    CaCO3

  3. C

    Na2CO3

  4. D

    K2CO3

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    Solution:

    CaCO3(s)ΔCO2(g)+CaO(s)A colourless  B  CaO(s)B+H2OCa(OH)2(aq) Ca(OH)2+2CO2CaHCO32(aq) CaHCO32(s)ACaCO3(s)+CO2(g)+H2O(g)  Correct choice : (b) 

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