A) Ha
B) \[{{O}_{2}}\]
C) \[{{N}_{2}}\]
D) \[C{{O}_{2}}\]
Correct Answer: B
Solution :
Peroxides of alkali metal react with water to give oxygen. \[N{{a}_{2}}{{O}_{2}}+2{{H}_{2}}O\xrightarrow{{}}4NaOH+{{O}_{2}}\]
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