The formal charge on the starred oxygen in the carbonate ion is
[O − O||C − ∗O]2−

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-1

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-2

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Solution

The correct option is B -1
$F C = V - L - \frac{1}{2} (B)$

$V = V a l e n c e e l e c t r o n s = 6$

$L = L o n e p a i r e l e c t r o n s = 6$

$B = B o n d p a i r o f e l e c t r o n s = \frac{1}{2} (2) = 1$

$∴ F C = 6 - 6 - 1$

$F C = - 1$

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