Choose the INCORRECT statement.
◦ Oleum is SO3(g) dissolved in H2SO4.
◦ Oleum is called fuming sulfuric acid.
◦ Sulfuric and sulfurous acids are monoprotic.
◦ Acid salts are compounds formed from polyprotic acids by neutralizing one hydrogen.
◦ Thio in a name denotes that one oxygen is replaced by a sulfur.