1.

CO_2gas along with solid (Y) is obtained when sodium salt (X) is heated. (X) is again obtained when CO_2gas is passed into aqueous solution of (Y). (X) and (Y) are respectively

Answer»

`Na_2CO_3, Na_2O`
`Na_2CO_3, NAOH`
`NaHCO_3 , Na_2CO_3`
`Na_2CO_3, NaHCO_3`

SOLUTION :`UNDERSET(X)(2NaHCO_3) overset(Delta)(to) underset(Y)(Na_2CO_3) + CO_2 + H_2O`
`underset(Y)(Na_2CO_3) + H_2O + CO_2to underset(X)(2NaHCO_3)`


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