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The compound X on heating gives a colour...

The compound X on heating gives a colourless gas. The residue is dissolved in water to obtain Y Excess `CO_2` is bubbled through aqueous solution of Y, Z is formed. Z on gentle heating gives back X. The compound X is:

A

`CaCO_3`

B

`Na_2CO_3`

C

`CaSO_4 . 2H_2O`

D

`K_2CO_3`

Text Solution

Verified by Experts

The correct Answer is:
A
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