[" Sum of oxidation states of "],[" nitrogen and chromium in "],[(NH_(4))_(2)Cr_(2)O_(7)" is "]

(NH_(4))_(2)Cr_(2)O_(7) overset("heat") to

(NH_(4))_(2)Cr_(2)O_7 on heating gives:

Oxidation number of chromium in K_(2)Cr_(2)O_(7) is

The gas evolved on heating (NH_(4))_(2)Cr_(2)O_(7) is :

(NH_(4))_(2)Cr_(2)O_(7)overset(Delta)rarrN_(2)+4H_(2)O+X ( Chromium compound), oxidation state of chromium that changes from (NH_(4))_(2)Cr_(2)O_(7) to X is