Question

$N{a}_2{O}_2$

• A. is diamagnetic in nature
• B. is salt of dibasic acid $H_2{O}_2$
• C. oxidizes $C{r}^{3+}$(green) to $Cr{O}_4^{2-}$ (yellow)
• 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.
$H_2{O}_2\Rightarrow 2H^{+}+O_2^{2-}$
Thus, it is also salt of dibasic acid $H_2{O}_2$. $C{r}^{3+}$ is oxidised to $Cr{O}_4^{2-}$ in acidic medium
$C{r}^{3+}+O_2^{2-}+2H^{+}\to Cr{O}_4^{2-}+H_{2}O$