

| White phosphorus | Red Phosphorus |
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It is a soft and waxy solid. It possesses a garlic smell. |
It is a hard and crystalline solid, without any smell. |
| It is poisonous. | It is non-poisonous. |
| It is insoluble in water but soluble in carbon disulphide. | It is insoluble in both water and carbon disulphide. |
| It undergoes spontaneous combustion in air. | It is relatively less reactive. |
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In both solid and vapour states, it exists as a P4molecule.
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It exists as a chain of tetrahedral P4 units.
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