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What happens when (i) Sodium metal is dropped in water? (ii) Sodium metal is heated in free supply of air?

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What happens when

(i) Sodium metal is dropped in water? 

(ii) Sodium metal is heated in free supply of air? 

(iii) Sodium peroxide dissolves in water?

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(i) 2Na + 2H2O \(\rightarrow\) 2NaOH + H2 

(ii) 2Na + O2 \(\rightarrow\) Na2O2 

(iii) Na2O2 + 2H2O \(\rightarrow\) 2NaOH + H2O2

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