Question

Molecules/ions and their magnetic properties are given below

Molecule/Ion	Magnetic property
(i) $C_6{H}_6$	(1) Antiferromagnetic
(ii) $Cr{O}_2$	(2) Ferrimagnetic
(iii) $MnO$	(3) Ferromagnetic
(iv) ${Fe}_3{O}_4$	(4) Paramagnetic
(v) ${Fe}^{3+}$	(5) Diamagnetic

The correctly matched pairs in the above is:

• A. $i-5$ $ii-3$ $iii-2$ $iv-1$ $v-4$
• B. $i-3$ $ii-5$ $iii-1$ $iv-4$ $v-2$
• C. $i-5$ $ii-3$ $iii-1$ $iv-2$ $v-4$
• D. $i-5$ $ii-3$ $iii-1$ $iv-4$ $v-2$
• E. $i-4$ $ii-5$ $iii-1$ $iv-2$ $v-3$

Answer 1

Answer: (C)

$i-5$ $ii-3$ $iii-1$ $iv-2$ $v-4$

$C_6{H}_6$ is a diamagnetic substance, as it is weakly repelled by a magnetic field.
$Cr{O}_2$ is a ferromagnetic substance, which is attracted very strongly by a magnetic field.
$MnO$ is an antiferromagnetic substance as its domains cancel out each other's magnetic moment.
${Fe}_3{O}_4$ (magnetite) is a ferrimagnetic substance because in it the magnetic moments of the domains are aligned in parallel and anti-parallel direction in unequal number.
${Fe}^{3+}\left(3d^5\right)$ is paramagnetic because of the presence of unpaired electrons.
Thus, the correct match is
$i-5,ii-3,iii-1,iv-2,v-4$