question_answer

                In \[PO_{4}^{3-}\] ion, the formal charge on each oxygen atom and P?O bond order respectively are:

A)                 - 0.75, 0.6                            

B)                 - 0.75, 1.0                            

C)                 - 0.75, 1.25                         

D)                 - 3, 1.25

Correct Answer: C

Solution :

                Bond order between P?O                 \[=\frac{\text{no}\text{. of bonds in all possible direction}}{\text{Total no}\text{. of resonating structure}}\]                 \[=\frac{5}{4}=1.25\]                 Resonating structures are:                                 Total charge on \[PO_{4}^{3-}\] ion is \[-3\].                 So, the average formal charge on each \['O'\] atom is \[=-\frac{3}{4}=-0.75\]