4. Which of the following alkali metal forms peroxide when it reacts with dry air? a) Li b) Na d) Cs

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Sodium reacts with the oxygen in air to form sodium oxide, and traces of yellowish sodium peroxide. ( 4 N a+O_{2} rightarrow 2 N a_{2} O ) ( 2 N a_{2} O+O_{2} rightarrow 2 N a_{2} O_{2} )

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