Question

Phosphorus cannot form $PH_{5}$with outer electronic configuration as $3s^{3}3p^{3}$because

• A. Phosphorus cannot show +5 oxidation state
• B. $PH_{5}$is not a stable compound
• C. $\Delta_{a}H$value of dihydrogen and $\Delta_{eg}H$value of hydrogen do not favour higher oxidation state of phosphorus
• D. Phosphorus is not very reactive hence does not form $PH_{5}$.

Answer 1

Answer: (C)

$\Delta_{a}H$value of dihydrogen and $\Delta_{eg}H$value of hydrogen do not favour higher oxidation state of phosphorus

Answer 2

: Since higher oxidation state of P is not favoured by high $\Delta_{a}H$of dihydrogen and $\Delta_{eg}H$of hydrogen, P does not form $PH_{5}$though it exhibits+3 and +5 oxidation states.