Abstract
Selenium tetrachloride and bromide form SeX 3 + ions whereas selenium monochloride and bromide form Se 4 2+ and SeX 3 + ions, when dissolved in disulphuric acid. In disulphuric acid containing chlorine and bromine, selenium forms SeX 3 + ions, selenium monochloride forms Se 2Cl 3 + and Se 2Cl 2Br + whereas selenium monobromide forms Se 2Br 3 +, Se 2X 3 + disproportionates to form SeX 3 + and Se. Similar ions are formed when halogens are added to the yellow solutions of selenium (Se 4 2+) ions in disulphuric acid. All attempts to prepare the iodo derivatives of selenium in disulphuric acid have failed.
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