Calculate the formal charge on each atoms in `CO_(4)^(2-)` (per -oxocarbonate ion) .

Explanation

(a) `FC` on c-atom `=4 - 0 - (1)/(2) (8) = 0`
(b) `FC` on O-atoms (marked 1 and 4) `=6 -6- (1)/(2) xx 2`
`[{:(,"on each O-atom","",,),(,"or -2 on both",,,),(,"O-atoms",,,):}]`
(c ) `FC` on O-atoms(marked 2 and 3) `=6 - 4 - (1)/(2) xx 4`
(d) Sum of `FC's' `= Net charge on `CO_(4)^(2-) = -2`
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