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Number of paramagnetic oxides among following given oxides is Li2O, CaO, Na2O, KO2, MgO and K2O

1. 1
2. 2
3. 3
4. 0

Correct answer: 1

Solution

Among Li2O, CaO, Na2O, KO2, MgO, K2O only KO2 contains the superoxide ion O2- which has one unpaired electron and is paramagnetic; the rest are diamagnetic. Count = 1.

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