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A compound X on heating gives a colourle...

A compound X on heating gives a colourless gas. This 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 give back X. the X is

A

`Na_(2)CO_(3)`

B

`K_(2)CO_(3)`

C

`CaSO_(4).2H_(2)O`

D

`CaCO_(3)`

Text Solution

Verified by Experts

The correct Answer is:
D
`A overset(Delta)rarr` colourless `+` Residue
Residue `+` water `rarr B`
`B(eq.) + aq "of" CO_(2) rarr` (solid)
`C overset(Delta)rarr A`
Colorless gas `rarr CO_(2)` therefore A is `CaCO_(3)`
`CaCO_(3) overset(Delta)rarr CO_(2)+CaO`
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