The formal charges on the atoms marked as (1) to (4) in the Lewis representation of 
molecule respectively are
Text Solution
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The formal charge (F.C.) of an atom in a Lewis structure is calculated using the formula:
F.C. 
Total valence electrons 
- [Total non-bonding (lone pair) electrons 
- 
[Total bonding (shared) electrons]
For atom (1) Oxygen: Valence 
, Lone pair 
, Bonding 
.
For atom (2) Nitrogen: Valence 
, Lone pair 
, Bonding 
.
For atom (3) Oxygen: Valence 
, Lone pair 
, Bonding 
.
For atom (4) Oxygen: Valence 
, Lone pair 
, Bonding 
.
The formal charges are 
respectively.
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