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A solid compound 'X' on heating gives CO...

A solid compound `'X'` on heating gives `CO_(2)` gas and a residue. The residue mixed with water forms `'Y'`. On passing an excess of `CO_(2)` through `'Y'` in water , a clear solution, `'Z'` is obtained. On boiling `'Z'`, compound `'X'` is reformed. The compound `'X'` is

A

`Ca(HCO_(3))_(2)`

B

`CaCO_(3)`

C

`Na_(2)CO_(3)`

D

`K_(2)CO_(3)`

Text Solution

Verified by Experts

The correct Answer is:
B
`underset((X))(Ca)CO_(3) rarr CaO+CO_(2)`
`CaO+H_(2)O rarr Caunderset((Y))((OH)_(2))`
`Ca(OH)_(2)+2CO_(2) rarr Caunderset((Z))((HCO_(3))_(2))`
`underset((Z))(Ca)(HCO_(3))_(2) overset(Delta)rarr CaCO_(3)+underset((X))(H_(2))O`
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