In $$ PO^{3 -}_4 $$ ion, the formal charge on each oxygen atom and $$ P - O $$ bond order respectively are
Correct option is A. $$ - 0.75 , 1.25 $$
Formal charge on each oxygen atom $$ = \cfrac { -3}{4} = -0.75 $$
Bond order = $$ \cfrac { total \ bonds}{ no \ of \ resonating \ structures} = \cfrac {5}{4} = 1.25 $$
Hence, Option "A" is the correct answer.