The Spin only magnetic moment value of square planar complex [Pt (...

Spin only magnetic moment can be calculated by the following formula
Magnetic moment =$\sqrt{n ( n + 2 )}$
Where, n is number of unpaired electrons.

In the given compound, ${Pt}^{2 +}\left({d}^{8}\right)$

${Pt}^{2 +} \to {dsp}^{2}$ hybridization and have no unpaired electrons..

$∴$ Magnetic moment

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