Correct statement about alkali metal oxides is :
Correct statement about alkali metal oxides is :
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- peroxides are colored.
- superoxides are paramagnetic.
- oxides are paramagnetic.
- peroxides are both colored and paramagnetic.
The Correct Option is B
Solution and Explanation
Step 2: Peroxides contain O22- (\(\sigma^2\pi^4\pi^{*4}\)): all electrons paired, diamagnetic and colourless/white (Na2O2 is pale yellow only from traces of superoxide). So (A) and (D) are wrong.
Step 3: Superoxides contain O2- with 17 electrons: one unpaired electron in \(\pi^*\) orbital, so they are paramagnetic (and coloured, e.g. KO2 is orange).
Answer: (B) superoxides are paramagnetic.
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