Statement 1: The spin only magnetic moment of ${\mathrm{Sc}}^{3+}$ is 1.73 B.M.

Statement 2: The spin only magnetic moment of an ion is equal to $\sqrt{\mathrm{n}\left(\mathrm{n}+2\right)}$; where n is the number of unpaired electrons in the ion.

Statement 1: False; ${\mathrm{Sc}}^{3+}$ ion has no unpaired electron $\left(3{\mathrm{d}}^{0}4{\mathrm{s}}^0\right)$ and thus has zero magnetic moment.
Statement 2: Magnetic moment is due to 'spin only' = $\sqrt{\mathrm{n}\left(\mathrm{n}+2\right)}$ B.M. value. n is number of unpaired electron(s).