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Though P2O5 is a very good desiccant, it...

Though `P_2O_5` is a very good desiccant, its utility for drying is limited. Give reasons

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`P_2O_5` is a very good dehydratinga gent, but, is not used popularly asa dehydratinga gent,because, the water absorbed by this forms a protective viscous coating that inhibits further dehydration. However, granular form of `P_4O_10` can be used as a good dehydrating agent
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