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Q.

Which among the following is coloured and paramagnetic

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a

Li2O

b

Na2O

c

K2O

d

KO2

answer is D.

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Detailed Solution

  • KO2​ is a superoxide which contained odd number of electrons (unpaired electron). 
  • Therefore KO2 is paramagnetic and colored  in nature.
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Which among the following is coloured and paramagnetic