Statement 1: The green manganate is paramagnetic but the purple permanganate is diamagnetic in nature.

Statement 2: ${\mathrm{MnO}}_4^{2-}$ contains one unpaired electron while in ${\mathrm{MnO}}_4^{-}$ all electrons are paired.

Statement 1: Correct statement and reason is correct explanation of assertion.
$\text{Green}\to {\text{MnO}}_4^{2-}-{\left[\mathrm{Ar}\right]}^{18}3{\mathrm{d}}^{1}4{\mathrm{s}}^0;$ there is one unpaired electron, so paramagnetic.
$\text{Purple}\to {\text{MnO}}_4^{-}-{\left[\mathrm{Ar}\right]}^{18}3{\mathrm{d}}^{0}4{\mathrm{s}}^0;$ here all electrons are paired, so diamagnetic.