Reaction at equilibirium N2O4⇌2NO2 According to Le chatelier's principle- (a) addition of an inert gas at constant pressure will increase volume and equilibirium shifts towards more number of molecules. (b) Decomposition of N2O4 will be endothermic, so reaction will move in forward reaction when temperature is increased.So, It is incorrect. It will not effect reaction (volume is constant) (c) Increasing the pressure on a gas reaction shifts theposition of equilibirium towards thesidewith fewer molecules. So, it will move in backward direction which leads to formation of N2O4 from NO2.