Which of the following statements

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Question:
Which of the following statements about $\mathrm{Na}_{2} \mathrm{O}_{2}$ is not correct?

$\mathrm{Na}_{2} \mathrm{O}_{2}$ oxidises $\mathrm{Cr}^{3+}$ to $\mathrm{CrO}_{4}^{2-}$ in acid medium
It is diamagnetic in nature
It is the super oxide of sodium
It is a derivative of $\mathrm{H}_{2} \mathrm{O}_{2}$

Correct Option: , 3

Solution: