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(A) Potassium $(K)$ is a highly reactive alkali metal. It reacts vigorously with oxygen in the air to form potassium oxide $(K_2O)$ and potassium pero

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Potassium

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(A) Potassium $(K)$ is a highly reactive alkali metal. It reacts vigorously with oxygen in the air to form potassium oxide $(K_2O)$ and potassium peroxide $(K_2O_2)$. Due to this high reactivity,it reacts spontaneously with atmospheric moisture and oxygen,which can cause it to catch fire. Therefore,it is stored under kerosene to prevent contact with air and moisture.

Which metal catches fire when kept exposed to air?

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