Similarly, V2O5 reacts with alkalies as well as acids
to give
43
VO   and
4
VO  respectively The well characterised CrO is basic
but Cr2O3 is amphoteric Potassium dichromate K2Cr2O7
Potassium dichromate is a very important chemical used in leather
industry and as an oxidant for preparation of many azo compounds Dichromates are generally prepared from chromate, which in turn are
obtained by the fusion of chromite ore (FeCr2O4) with sodium or
potassium carbonate in free access of air