Answer :

Final answer:

White phosphorus rounds cannot be stored exposed to air as they may spontaneously ignite; they must be stored in water to prevent combustion.

Explanation:

120mm white phosphorus rounds cannot be stored in an environment where they are exposed to air. White phosphorus is a highly reactive substance that is insoluble in water and highly soluble in carbon disulfide. It spontaneously ignites upon exposure to air because white phosphorus is chemically very reactive and exists as P4 tetrahedral molecules that are prone to combustion.

The appropriate method of storage to prevent natural combustion is submersion in water. Unlike white phosphorus, red phosphorus can be safely stored in air as it is much less reactive and does not spontaneously combust due to its polymeric structure.

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