Question:

The compound A on heating gives a colourless gas and a residue that is dissolved in water to obtain B. Excess of ${CO_2}$ is bubbled through aqueous solution of B, C is formed which is recovered in the solid form. Solid C on gentle heating gives back A. The compound A is -

Updated On: Jun 9, 2024
  • ${Na_2 CO_3}$
  • ${K_2 CO_3}$
  • ${CaSO4.2H2O}$
  • ${CaCO_3}$
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The Correct Option is D

Solution and Explanation

Given,
Thus, the compound $'A'$ must be $CaCO_3$ and the reactions are as follows
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