A small piece of sodium is observed to catch fire suddenly when it is kept in air for some time.
Give reason for this observation.
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Beacuse sodium is highly reactive in the atmosphere.
When sodium is exposed to air ,it burns vigourously so it is kept in kerosene.
When sodium is exposed to air ,it burns vigourously so it is kept in kerosene.
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Answer:
Explanation:
A small piece of sodium catches fire suddenly when it is kept in air for some time as it burns in the presence of air and form the corresponding exides at the room temperature. Sodium reacts with the oxygen in air to form an oxide called the sodium oxide, and traces of yellow sodium peroxide.
4Na+O2→2Na2O
2Na2O+O2→2Na2O2
Therefore, the sodium metal should be immersed in kerosene oil, if it is kept open it reacts vigorously with oxygen and the moisture that is already present in the air and thus catches fire.
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