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Question:

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 ?

Answer:

(i) When Na metal is dropped in water, it reacts violently to form sodium hydroxide and hydrogen gas. The chemical equation involved in the reaction is:

2Na(s)   +  2H2O(l)   →    2NaOH(aq)  +  H2(g)

(ii) On being heated in air, sodium reacts vigorously with oxygen to form sodium peroxide. The chemical equation involved in the reaction is:

2Na(s)   +  O2(s)   →    Na2O2(s) 

(iii) When sodium peroxide is dissolved in water, it is readily hydrolysed to form sodium hydroxide and water. The chemical equation involved in the reaction is:

Na2O2(s)  +   2H2O(l)   →   2NaOH(aq)   +  H2O2(aq)


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