Question

The oxidation number of the underlined atom in the following species
dentify the incorrect option

• A. $C{u}_2\underline{O}$ is $-1$
• B. $\underline{Cl}{O}_3^{-}$ is $+5$
• C. $K_2{\underline{Cr}}_2{O}_7$ is $+6$
• D. $H\underline{Au}C{l}_4$ is $+3$

Answer 1

Answer: (A)

Ox. state of "O" in $C{u}_{2}O=-2$
Ox. state of "Cl" in $Cl{O}_3^{-}=+5$
Ox. state of "Cr" in $K_{2}C{r}_2{O}_7=+6$
Ox. state of "Au" in $HAuC{l}_4=+3$