Q. The element which forms oxides in all oxidation states to is

 2402  216 AIIMSAIIMS 2004The p-Block Elements - Part2 Report Error

Solution:

The common oxidation state of elements of A group are and . In addition nitrogen also exist in , and oxidation states in its oxide, viz and .
However due to inert pair effect, bismuth does not exist in oxidation state. Thus nitrogen exist in all oxidation state to .