Question

Reaction of sodium peroxide with water can be written as:
\[2N{a_2}{O_2} + 2{H_2}O(l) \to 4NaOH + {O_2}(g)\].
True
False.

Answer 1

Hint: When sodium peroxide dissolves in hot water, then it forms sodium hydroxide and oxygen. While when sodium peroxide dissolves in cold water, then it forms sodium hydroxide and hydrogen peroxide.

Complete step by step answer:
When sodium peroxide dissolves in hot water, then it forms sodium hydroxide and oxygen.
\[2N{a_2}{O_2} + 2{H_2}O(l) \to 4NaOH + {O_2}(g)\]
When sodium peroxide dissolves in cold water, then it forms sodium hydroxide and hydrogen peroxide.
\[{\text{N}}{{\text{a}}_2}{{\text{O}}_2}{\text{ + 2}}{{\text{H}}_2}{\text{O }} \to {\text{ 2NaOH + }}{{\text{H}}_2}{{\text{O}}_2}\]
In this reaction sodium peroxide reacts with cold water very violently, hence it is exothermic in nature.
If we talk about types of reaction based on the energy consumption and release then it is divided into two categories: exothermic and endothermic reactions.
Exothermic reaction: Those reactions in which energy is released in the form of heat and light.
Endothermic reaction: Those reactions in which energy is required to perform the reaction.
Sodium peroxide is used as an oxidizing agent. It is also used as an oxygen source by reacting it with carbon dioxide to produce oxygen and sodium carbonate:
 \[2{\text{ }}N{a_2}{O_2}\; + {\text{ }}2{\text{ }}C{O_2}\; \to {\text{ }}2{\text{ }}N{a_2}C{O_3}\; + {\text{ }}O.\]
Yes, so the reaction given in the question is true.

Note:
The reaction of sodium peroxide with water follows two conditions i.e. with hot water and with cold water. In both the reactions products are different. So you must check whether the question is asking for hot water or for cold water if nothing is said to you then you can write off the two.