Question

$N{a}_2{O}_2$ is

• A. Diamagnetic in nature
  
• B. Salt of dibasic acid $H_2{O}_2$
  
• C. Oxidizes $C{r}^{3+}$ (green) to $Cr{O}_4^{2-}\left(yellow\right)$
  
• D. All are correct properties of $N{a}_2{O}_2$

Answer 1

The correct option is D

All are correct properties of $N{a}_2{O}_2$

$N{a}_2{O}_2$ has peroxide ion $O_2^{2-}\left(18e^{-}\right).$
It has all paired electrons and is thus diamagnetic.
$H_2{O}_2\to 2H^{+}+O_2^{2-}$
Thus, it is also salt of dibasic acid $H_2{O}_2.$ $C{r}^{3+}$ is oxidised to $Cr{O}_4^{2-}$ in acedic medium.
$C{r}^{3+}+O_2^{2-}+2H^{+}\to Cr{O}_4^{2-}+H_{2}O$