question_answer

The formal charges of \[{{\text{N}}_{\text{(1)}}}\text{,}{{\text{N}}_{\text{(2)}}}\]and O atoms in are respectively

A) \[+1,-1,0\]                          

B) \[-1,+1,0\]

C) \[+1,+1,0\]                         

D) \[-1,-1,0\]

Correct Answer: B

Solution :

\[\text{Forma lcharge =}\left[ \begin{matrix}    \text{Total number of vaience}  \\    \text{electrons in the free atom}  \\ \end{matrix} \right]\] \[\text{-}\left[ \begin{align}   & \text{Total number of} \\  & \text{non-bonding} \\  & \text{(lone pair) electrons} \\ \end{align} \right]\text{-}\frac{\text{1}}{\text{2}}\left[ \begin{align}   & \text{Total number of} \\  & \text{bonding (shared} \\  & \text{elctrons)} \\ \end{align} \right]\] In structure the forma charge on ?.the end N atom marked 1, \[=5-4-\frac{1}{2}(4)=5-4-2=-1\]the central N atom mailed 2, \[=5-0-\frac{1}{2}(8)=5-4=+1\] The end O atom, \[=6=4-\frac{1}{2}(4)=6-6=0\]