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Q.

Which of the following substance is paramagnetic ?

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a

${Na}_{2} O$

b

${Na}_{2} O_{2}$

c

${KO}_{2}$

d

$K_{2} O_{2}$

answer is C.

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Detailed Solution

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Paramagnetism is shown by those substances in which one or more unpaired electrons are present. Ex: KO₂.
KO₂is a superoxide which contains odd number of electrons (unpaired electron).

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