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Magnetic Properties

Which of the ...

Question

Which of the following becomes paramagnetic on heating?

A

M n O

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B

F e_{3} O_{4}

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C

Z n F e_{2} O_{4}

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D

B

and

C

both

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Solution

The correct option is D $B$ and $C$ both
Ferrimagnetic change their nature on heating and become paramagnetic
eg. $F e_{3} O_{4}, Z n F e_{2} O_{4}, M g F e_{2} O_{4}$

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Q. Assertion :Substances like

F e_{3} O_{4}

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.

Q. Assertion: On heating ferromagnetic or ferrimagnetic substances, they become paramagnetic.
Reason: Both ferromagnetic and ferromagnetic are strongly attracted by the magnetic field.

Q. Which one of the following compound is both colored and paramagnetic?

Q. Among the following the compounds which one is both paramagnetic and coloured?

Balance the following in basic medium:

F e_{3} O_{4} + {M n O}_{4}^{-} \to F e_{2} O_{3} + M n O_{2}

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