Nitrous oxide, N 2 0, nitric oxide, NO, nitrogen trioxide, N203, nitrogen peroxide, N02, and nitrogen pentoxide, N205, whilst three oxyacids of nitrogen are known: hyponitrous acid, H2N202, nitrous acid, HN02, and nitric acid, HNO 3 (q.v.).
Nitrogen pentoxide, N 2 O 5, was first obtained in 1849 by H.
Three oxides of columbium are certainly known, namely the dioxide, Cb202, the tetroxide, Cb 2 0 4, and the pentoxide, Cb 2 0 5, whilst a fourth oxide, columbium trioxide, Cb203, has been described by E.
It burns readily in air, and is converted into the pentoxide when fused with acid potassium sulphate.
Tetroxide, Cb204, is obtained as a black powder when the pentoxide is heated to a high temperature in a current of hydrogen.