Question

The formal charge on $Cl$ in $HCl{O}_3$ and $Cl{O}_3^{-}$ is:

• A. 0 and -1 respectively
• B. 0 and 0 respectively
• C. -1 and -1 respectively
• D. -1 and 0 respectively

Answer 1

The correct option is B 0 and 0 respectively

Formal Charge on any atom is calculated as :
Formal charge $\left(FC\right)$ = $V-L-\frac{B}{2}$
where,
$V$ = Total number of valence electrons in the valence shell of the atom.
$L$ = Total number of non bonding (lone pair) electrons of the atom.
$B$ = Total number of bonding (shared) electrons of that particular atom.

$HCl{O}_3$


Formal charge = $V-L-\frac{B}{2}$ = $7-2-\frac{10}{2}$ = 0

$Cl{O}_3^{-}$


Formal charge = $V-L-\frac{B}{2}$ = $7-2-\frac{10}{2}$ = 0
Thus, formal charge of $Cl$ in $HCl{O}_3$ and $Cl{O}_3^{-}$ is 0 and 0 respectively.