what happens when sodium peroxide dissolves in water n sodium metal is dipped in water?

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Solution

When sodium peroxide dissolves in water:
2Na₂O₂ + 2H₂O --------------> 4NaOH + O₂
When sodium metal is dipped in water:
Sodium reacts violently with water, because amount of released energy is more than the ignition temperature of hydrogen gas liberated, so hydrogen gas catches fire.
Na + H₂O -------> NaOH + H₂

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