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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Small
molecular compound of selenium and tellurium