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NEET levelSingle correct optionDifficulty 1 of 3ss204

Which of the following is ferromagnetic at room temperature?

A $H X_{2} O$
B $NaCl$
C $CrO X_{2}$
D $MgO$

Answer: C

CrO X_{2}

has parallel alignment of spins in domains and is ferromagnetic.

NaCl

,

MgO

and

H X_{2} O

have only paired electrons and are diamagnetic.

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