Q4 / 150 · MHT CET 2021 (21 Sep Shift 1) · Chemistry

What is the formal charge on carbon atom in $\mathrm{CO}_3^{2-}$ ion?

  • A
    -2
  • B
    -4
  • C
    +4
  • Correct answer
    D
    zero

Solution

Figure
$$ \begin{aligned} & \text { Formal charg } e=\left[\begin{array}{c} \text { Total no.of valence } \\ \mathrm{e}^{-} \text {in freestate } \end{array}\right]-\left[\begin{array}{c} \text { Total no.oflone } \\ \text { pair electrons } \end{array}\right]-\frac{1}{2}\left[\begin{array}{c} \text { no.of bonding electrons } \\ \text { on that particular atom } \end{array}\right] \\ & =4-0-\frac{1}{2} \times 8=0 \\ & \end{aligned} $$

Hence, the correct answer is option: 'D'.

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