Consider the following equilibrium in a closed container<br> ${{\rm{N}}_2}{{\rm{O}}_4}\left( {\rm{g}} \right)\;\leftrightharpoons2{\rm{N}}{{\rm{O}}_2}\left( {\rm{g}} \right)$<br> At a fixed temperature, the volume of the reaction container is halved. For this change which of the following statement holds true regarding the equilibrium constant ${K_p}$ and degree of dissociation $\left( {\rm{\alpha }} \right)$ ?