Which of the following statements is/are true 

for substance  ${\mathrm{\Delta S}}_{\mathrm{vap}}^0>{\mathrm{\Delta S}}_{\mathrm{fusion}}^0$ in general

greater amount of heat will be required to dissociate $N{H}_3$  gas into $N_2$  and  $H_2$ at constant pressure condition as compared to constant volume condition at same temperature.

The reaction having rate law, $r=k{\left[A\right]}^2\left[B\right]$  will follow first order kinetics if [A] is very high and third order kinetics if [B] is very high.

Graphite being standard allotrope of carbon, graphite has less standard entropy $\left(S_m^0\right)$  than diamond.