Question

If the magnetic moment of the atoms of a substance is zero, the substance is called:

• A. Ferromagnetic
• B. Paramagnetic
• C. Diamagnetic
• D. Antiferromagnetic

Answer 1

Answer: (C)

Formula for magnetic moment $=\sqrt{n(n+2)}=\mu ,$

Where n is no. of unpaired electrons

$\because \mu =0,$

$\Rightarrow \sqrt{n(n+2)}=0$

$\Rightarrow n(n+2)=0.$

Product of two integer can only be zero; only if one of them is zero.

So, $n=0$

$\because$ For diamagnetic substance; no. of unpaired electrons is zero.

So, if magnetic moment of atoms of a substance is zero; the substance is diamagnetic.