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Q.

Which among the following is coloured and paramagnetic

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a

Na₂O

b

Li₂O

c

KO₂

d

K₂O

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