Which of the following shows anti-ferromagnetism?

Z r O_{2}

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C d O

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C r O_{2}

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M n_{2} O_{3}

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Solution

The correct option is B $M n_{2} O_{3}$
$M n O$ , $M n_{2} O_{3}$ and $M n_{2} O_{3}$ shows anti-ferromagnetism. Equal number of unpaired electrons are aligned in opposite directions, their magnetic moment (electron spin) will compensate each other's magnetic moment.
Ni, Fe, Co and $C r O_{2}$ shows ferromagnetism.

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