Question

The oxidation number of $Cl$ in $CaOC{l}_2$ is

• A. $-1$ and $+1$
• B. $+2$
• C. $-2$
• D. None

Answer 1

Answer: (A)

$C{a}^{2+}\left(OC{l}^{1-}\right)C{l}^{1-}$
$OC{l}^{\ominus }:-2+x=-1\Rightarrow x=+1$
$C{l}^{\ominus }:-1$
Oxidation states of $Cl$ are $-1$ and $+1$