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When a compound A is heated, it produces...

When a compound A is heated, it produces a colourless gas and the residue obtained is dissolved in water to form the compound B. The compound C is formed when excess `CO_2` is passed through aqueous solution of B. The compound C can be separated out in solid state from its solution. C in its solid state when heated forms the compound A. A is-

A

`CaCO_3`

B

`Na_2CO_3`

C

`K_2CO_3`

D

`CaSO_4.2H_2O`

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The correct Answer is:
A
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