MCQ
Resonance hybrid of nitrate ion is
  • A
    $\begin{matrix}
       ^{-1/2}O\underline{\overline{\cdots }}N\underline{\overline{\cdots }}{{O}^{-1/2}}  \\
       |\vdots |  \\
       \,\,\,\,\,\,\,\,\,{{O}^{-1/2}}  \\
    \end{matrix}$
  • B
    $\begin{matrix}    ^{-2/3}O\cdots N\cdots {{O}^{-2/3}}  \\
       \vdots   \\
       \,\,\,\,\,\,\,\,\,{{O}^{-2/3}}  \\
    \end{matrix}$
  • $\begin{matrix}
       ^{-2/3}O\cdots \overset{+}{\mathop{N}}\,\cdots {{O}^{-2/3}}  \\
       \vdots   \\
       \,\,\,\,\,\,\,\,\,{{O}^{-2/3}}  \\
    \end{matrix}$
  • D
    $\begin{matrix}
       ^{-1/3}O\underline{\overline{\cdots }}N\underline{\overline{\cdots }}{{O}^{-1/3}}  \\
       |\vdots |  \\
       \,\,\,\,\,\,\,\,\,{{O}^{-1/3}}  \\
    \end{matrix}$

Answer

Correct option: C.
$\begin{matrix}
   ^{-2/3}O\cdots \overset{+}{\mathop{N}}\,\cdots {{O}^{-2/3}}  \\
   \vdots   \\
   \,\,\,\,\,\,\,\,\,{{O}^{-2/3}}  \\
\end{matrix}$
c
Electrons are shared equally between the three nitrogen atoms. The overall charge on nitrate ion ( $NO _3^{-}$ion) is $-1$ which will be shared between $3 O$ - atoms. The structure $(C)$ clearly represents the correct resonance structure of nitrate ion.

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