Which of the following metal oxides is anti-ferromagnetic in nature?

M n O

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T i O_{2}

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V O_{2}

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C r O_{2}

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Solution

The correct option is A $M n O$
Antiferromagnetism occurs if the alignment of moments is in a compensatory way so as to give zero net moment. For e.g. MnO.
All magnetically ordered solids (ferromagnetic and antiferromagnetic solids) transform to the paramagnetic state at some elevated temperatures. This is most probably due to the randomisation of spins.

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The metal which is ferromagnetic in nature is:

Which of the following oxides shows electrical properties like metals ?

(a) $S i O_{2}$ (b) MgO (c) $S O_{2} () s$ (d) $C r O_{2}$

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