JEE Class main Answered

(2) The resonating structures of nitrate ion NO₃^- are:

Bond order of NO bond is = 4/3 = 1.33   (Total number of bonds/Resonating structures)

(3) Formal charge=+ or - [Number of valence electron on atom -(non-bonded electrons+number of bonding electrons/2)]

So, Here three O will have separate formal charges, because three of them are having different number of bonds and non-bonded electrons.

Formal charges of O

1st(with double bond),  6-[4+2/2]=-1 (-because O is non-metal gains the electron))

2nd(with -1 Charge),  7-[6+1/2]=-1/2

3rd, 6-[5+1/2]=-1/2

So, average formal charge of O would be= -2/3

Average formal charge would be