Phosphorus is poisonous and can spontaneously ignite when it comes in contact with air.That's why its stored underwater to prevent its contact with air
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It is insoluble in water, but soluble in carbon disulfide. It takes fire spontaneously in air, burning to the pentoxide. White phosphorus should be kept under water, as it is dangerously reactive in air, and it should be handled with forceps, as contact with the skin may cause severe burns.
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