Although selenic and telluric acids contain the central atom in the 6 oxidation state, they are very
different. The properties of selenic acid, H 2 SeO 4, are very similar to those of H 2 SO 4, and many of their
salts are similar. The oxyacid that contains Te in the 6 state is H6TeO 6 which can also be written as
Te(OH) 6. This acid can be prepared from Te or TeO 2 by suitable oxidation reactions, and it can be also
obtained as a solid hydrate. As expected from the formula, telluric acid is a weak acid, although some
salts can be obtained in which one or more protons are replaced.