Question

Which of the following acid-naming rules is INCORRECT 
A all acid names end with "-ic"
B acids formed from sulfate ions will end in "-ic"
C acids formed from chloride ions will end in "-ic"
D acids formed from sulfite ions will end in "-ous"

Answer 1

The answer to this question would be: A. all acid names end with "-ic"

Not all acid have "-id" suffix for their name. The example of this was already mentioned in the question as the sulfite ion will be called sulfurous acid. The "-ous" name is given to acid with lower oxidation state. Sulfuric acid will be the H2SO4 which have higher oxidation state.

Answer 2

Answer: The incorrect statement is all acid names end with -ic.

Explanation:

Acids are defined as the chemical species which donate hydrogen ions when dissolved in water.

$HA(aq.)\rightarrow H^+(aq.)+A^-(aq.)$

The nomenclature of the acids that are derived from the anions attached to hydrogen ion:

• If the name of the anion attached ends with -ate, then the prefix of the acid is -ic. For Example: $H_3PO_4$, the anion is phosphate and the name of the acid is phosphoric acid.
• If the name of the anion attached ends with -ite, then the prefix of the acid is -ous. For Example: $H_2SO_3$, the anion is sulfite and the name of the acid is sulfurous acid.
• If the name of the anion attached ends with -ide, then the prefix of the acid is -ic. For Example: HCl, the anion is chloride and the name of the acid is hydrochloric acid.

Hence, the incorrect statement is all acid names end with -ic.