Sodium metal reacts with $Al_2O_3$ at high temperature to give a sodium compound $X$. Compound $X$ reacts with carbon dioxide in water to give $Y$. What is $Y$?

  • A
    $Na_2O$
  • B
    $Na_2CO_3$
  • C
    $Na_2O_2$
  • D
    $NaOH$

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