Assertion :Substances like $F e_{3} O_{4}$ and $M g F e_{2} O_{4}$ lose ferrimagnetism on heating and become paramagnetic. Reason: Magnetic moments of the domains in these substances are aligned in parallel and antiparallel directions in unequal numbers.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
At room temperature, $F e_{3} O_{4}$ is ferrimagnetic but as room temperature is raised randomization of spin takes place and the order and alignment between dipoles gets destroyed. So, it looses its intrinsic magnetic moment and after that shows induced magnetism.

In $F e_{3} O_{4}$ , at room temperature, the domains adjoining in parallel and antiparallel directions are unequal in numbers. So, as to give a small magnetic moment to it.

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