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The gas A is bubbled through lime water ...

The gas A is bubbled through lime water , a while precipitate is formed . This precipitate dissolved on prolonged bubbling the same gas. On heating this solution, the white precipitate reappears with the evolution of gas B . The gases A and B respectively are

A

`CO and CO`

B

`CO_(2) and CO`

C

`CO and CO_(2)`

D

`CO_(2) and CO_(2)`

Text Solution

Verified by Experts

The correct Answer is:
D
`underset("(A)")CO_(2)+Ca(OH)_(2) rarr underset("white ppt")(CaCO_(3)) darr +H_(2)O`
`Ca(HCO_(3))_(2) overset("Heat")rarr CaCO_(3) + underset("(B)") (CO_(2)) +H_(2)O`
`CaCO_(3) +CO_(2) +H_(2) O rarr underset ("(Soluble in water)") underset("Calcium bicarbonate") (Ca(HCO_(3))_(2))`
A and B are `CO_(2) and CO_(2)`.
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