Hydrogen compounds of selenium and tellurium

Hydrogen compounds of selenium and tellurium

Hydrogen selenide H2Se and hydrogen telluride H2Te are similar in properties to hydrogen sulfide, but much less stable. Thermal decomposition of H2Se proceeds at a noticeable rate at 150 °, and H2Te already at 0 °. The usual way to obtain H2Se and H2Te is the decomposition of selenides and tellurides with water or acids:
Al2Se3 + 6H2O = 2Al (OH) 3 + 3H4Se;
FeSe + 2HCl = FeCl2 + H2Se.

Hydrogen selenide and hydrogen telluride are colorless gases with an unpleasant odor reminiscent of hydrogen sulfide (H2Se) and arsenous hydrogen (H2Te). They dissolve in water. H2Se and H2Te are stronger acids than H2S.

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9 Rhenium characteristics	10 The discovery history of Rhenium
11 Extraction of selenium from gold bearing stone	12 Selenium is extracted from dust by sulphate and cellulose sulphate plants
13 Selenium and tellurium are extracted from anode slag for copper refining	14 Sources of selenium and tellurium
15 Applications of selenium and tellurium	16 Selenides and tellurides
17 A hydrogen compound of selenium and tellurium	18 Small molecular compound of selenium and tellurium
19 Selenate and telluride	20 Selenium acid and telluric acid