A colourless gas X is produced when egg ...

A colourless gas X is produced when egg shell is treated with a solution Y. The gas X turns lime water milky. What are X and Y?

`X=CO_(2)andY=NaCl`

`Y=HClandX=CO_(2)`

`Y=NaClandX=Cl_(2)`

`Y=H_(2)SO_(4)andX=O_(2)`

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