At higher temperature sodium metal reacts with alumina to give a sodium compound `'X'.'X'` is dissolved in water and then carbon dioxide gas is passed through it, a compound `'Y'` is formed. The compound `'X'` and `'Y'` are respectively

Options

A. `Na_(2)O_(2)` and `Na_(2)CO_(3)`
B. `Na_(2)O` and `Na_(2)CO_(3)`
C. `Na_(2)O_(2)` and `NaAlO_(2)`
D. `NaAlO_(2)` and `Na_(2)CO_(3)`

Answer

2

Explanation

`Al_(2)O_(3)+6Nararr3Na_(2)O(X)+2Al,Na_(2)O+H_(2)Orarr2NaOH`
`NaOH+CO_(2)rarrNa_(2)CO_(3)+H_(2)O`
Note `: " "Na_(2)O_(2)` is formed is presence of air.