[AIIMS 1999]
A) $ Na_2O $
B) $ NaOH $
C) $ Na_2CO_3 $
D) $ Na_2O_2 $
Correct Answer: A
$ 2Na+\frac{1}{2}O_2\xrightarrow{\text{moist air}}Na_2O $
$ Na_2O+2H_2O\xrightarrow{{}}2NaOH+H_2 $ .
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