[Pb. PMT 1999]
A) $ H_2 $
B) $ N_2 $
C) $ O_2 $
D) $ CO_2 $
Correct Answer: C
$ 2Na_2O_2+2H_2O\to 4NaOH+O_2 $ . In this reaction oxygen $ 2NaCl+2H_2O\xrightarrow{Electrolysis} $ is formed.
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