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Ions of an element of group 1 participat...

Ions of an element of group 1 participate in the transmission of nerve signals and transport of sugars and aminoacids into cells. This element imparts yellow colour to the flame in flame test and forms an oxide and a peroxide with oxygen. Identify the element and write chemical reaction to show the formation of its peroxide. Why does the element impart colour to the flame?

Text Solution

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Yellow colour flame in flame test indicates that the alkali metal must be sodium. It reacts with `O_(2)` to form a mixture of sodium peroxide `Na_(2)O_(2)` and sodium oxide `Na_(2)O`.
`4Na +O_(2) overset(Delta)rarr 2Na_(2)O` (Minor)
`2Na_(2)O +O_(2) overset(Delta)rarr 2Na_(2)O_(2)` (Major)
`2Na +O_(2) overset(Delta)rarr Na_(2)O_(2)`
Ionisation enthalpy of sodium is low. when sodium metal or its salt is heated in Bunsen flame, the flame energy causes an excitation of theoutermost electron which on reverting back to its initial position gives out the absorbed energy as visible light and complementary colour of absorbed colour from the light radiation is seen. That's why sodium imparts yellow colour to the flame.
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