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
`Na_(2)CO_(3)`
B
`K_(2)CO_(3)`
C
`Ca(HCO_(3))_(2)`
D
`CaCO_(3)`
Text Solution
Verified by Experts
The correct Answer is:
D
A solid compound 'X' on ………….. The given compound 'X' must be `CaCO_(3)` . It can be explained by following reactions. `underset(X)(CaCO_(3))overset(Delta)rarr underset("Resideue")(CaO)+CO_(2)uarr, CaO+H_(2)Orarr` `underset((Y))(Ca(OH)_(2))` `Ca(OH)_(2)+CO_(2)+H_(2)OrarrCa underset(z)((HCO_(3)))` `Ca(HCO_(3))_(2)overset(Delta)rarr underset((X))(CaCO_(3))+CO_(2)uarr+H_(2)O`
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