Question

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

• A. $Cu_{2}\underline{O}$ is $-1$
• B. $\underline{Cl}O^{-}_{3}$ is $+5$
• C. $K_{2}\underline{Cr}_{2}O_{7}$ is $+6$
• D. $H\underline{Au}Cl_{4}$ is $+3$

Answer 1

Answer: (A)

Ox. state of "O" in $Cu_{2}O=-2$
Ox. state of "Cl" in $ClO^{-}_{3}=+5$
Ox. state of "Cr" in $K_{2}Cr_{2}O_{7}=+6$
Ox. state of "Au" in $HAuCl_{4}=+3$