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Ask iit jee aieee pet cbse icse state board experts Expert Question: WHY PHOSPHORUS PENTA HYDRYED DOES NOT EXIST.
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NISHUHATIAN (0)

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PHOSPHORUS PENTA HYDRYED DOES NOT EXIST.
    
varshavallig (800)

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P can have oxdn state from -3 to +5 .but in PH5 it would have an oxdn state of -% which is not possible.thus PH5 is not possible

hope this helps
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krishna.gopal (2697)

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For exciting phosphorus to sp3d configration. Energy of PH bond is not high enough to cause this excitation

Krishna Gopal Singh
B.Tech Chemical Engg
IIT Delhi 2002
Currently doing PhD from IIT Delhi
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lawyersmb (170)

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i accept varshavallig's answer, it doesn't show -5 oxidation state
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