Sodium peroxide (Na₂O₂)

         Preparation : It is manufactured by heating sodium metal on aluminium trays in air (free from CO₂)

         Properties : (a)  When pure it is colourless. The faded yellow colour of the commercial product is because of presence of small amount of superoxide (Na₂O)

         (b) On coming with moist air it become white because of the formation of NaOH and Na₂CO₃.

         (c) It is powerful oxidising agent. It oxidises the Cr(III) hydroxide to sodium chromate, Mn(II) to obtain sodium manganate and sulphides to the sulphates of it.

         Uses : As a bleaching agent and it is used for the purification of air in confined spaces such as submarines because it can combine with CO₂ to give Na₂CO₃ and oxygen, .

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