Nitrogen forms the largest number of oxides as it is capable of forming stable multiple bonds with oxygen.They range from N_2O(O.S of nitrogen+1) through NO, N_2O_3,NO_2,N_2O_4 to N_2O_5(O.S of nitrogen +5). Following points are important regarding the study of oxides of nitrogen. (a)All oxides of nitrogen except N_2O_6 and endothermic as a large amount of energy is required to dissociate the stable molecule of oxygen and nitrogen. (b)The small electronegativity difference between oxygen and nitrogen make N-O bond easily breakable to give oxygen and hence oxides of nitrogen are said to be better oxidising agents. (c )Except N_2O_5, all are gases at ordinary temperature. N_2O_3 is stable only at lower temperature (253 K). (d) Except N_2O and NO which are neutral oxides, all are acidic oxides which dissolve in water forming corresponding oxy acids. (e)They are also good example for illustrating the concept the resonance. Which of the following statement is correct for the oxides of nitrogen ?