Correct statement about alkali metal oxides is :

The peroxide and oxides of alkali metals are colourless when pure. <br/><br/> Superoxides are paramagnetic while peroxides are diamagnetic. Electronic configuration of $\mathrm{O}_{2}^{2-}$ (peroxide) <br/><br/> $\left(\sigma 1 s^{2}\right)\left(\sigma^{*} 1 s^{2}\right)\left(\sigma 2 s^{2}\right)\left(\sigma^{*} 2 s^{2}\right)\left(\sigma 2 p_{z}^{2}\right)\left(\pi 2 p_{x}^{2} \pi 2 p_{y}^{2}\right)$ $\left(\pi^{*} 2 p_{x}^{2} \pi^{*} 2 p_{y}^{2}\right)$ <br/><br/> Electronic configuration of $\mathrm{O}_{2}^{-}$<br/><br/> $\left(\sigma 1 s^{2}\right)\left(\sigma^{*} 1 s^{2}\right)\left(\sigma 2 s^{2}\right)\left(\sigma^{*} 2 s^{2}\right)\left(\sigma 2 p_{z}^{2}\right)\left(\pi 2 p_{x}^{2} \quad \pi 2 p_{y}^{2}\right)$ $\left(\pi^{*} 2 p_{x}^{2} \pi^{*} 2 p_{y}^{1}\right)$ <br/><br/> superoxide is paramagnetic due 1 unpaired electron.