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What is the formal charge on carbon atom in $\mathrm{CO}_3^{2-}$ ion?
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The correct answer is:
zero
$$
\begin{aligned}
& \text { Formal charg } e=\left[\begin{array}{c}
\text { Total no.of valence } \\
\mathrm{e}^{-} \text {in freestate }
\end{array}\right]-\left[\begin{array}{c}
\text { Total no.oflone } \\
\text { pair electrons }
\end{array}\right]-\frac{1}{2}\left[\begin{array}{c}
\text { no.of bonding electrons } \\
\text { on that particular atom }
\end{array}\right] \\
& =4-0-\frac{1}{2} \times 8=0 \\
&
\end{aligned}
$$
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