In which process does the nitrogen undergo oxidation ?

In which among the oxides of nitrogen is the oxidation number of nitrogen lowest ?

In which among the oxides of nitrogen is the oxidation number of nitrogen lowest ?

For increase in internal energy of a system is equal to the work done on the system. Which process does the system undergo ?

In Goldsmith thermite process, element undergoing oxidation is

In which reaction does nitrogen exhibit variation of oxidation state from -3 to +5 ?