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Sodium and potassium are most reacting metals . they react vigorously with atmospheric oxygen and catches fire . hence to avoid accidental fire they kept in kerosene
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 sodium and potassium react with air when they're kept in open air......so to reduce or stop them to react and cause fire ,kerosene is added.kerosene as you know is an oil and like oil it will float....this will create a layer on the top and hence ,will stop them both from reacting...
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