Answer:
Phosphorus shows both (+3) and (+5)
oxidation states in its compounds; however PH5 does not exist in nature. It is
due to following two probable reasons:
(i) Bond energy of \[{{H}_{2}}\]
molecule is very high or enthalpy of atomisation of hydrogen is very high.
(ii) Electron gain enthalpy of hydrogen does not favour the
formation of\[P{{H}_{5}}\].
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