Concept:An acidic salt is a salt that produces an acidic solution when dissolved in water.
Explanation:Acidic salts are formed from the partial neutralisation of a strong acid by a weak base.
When such a salt dissolves in water, it releases hydrogen ions,
H+, into the solution.
Therefore, the characteristic feature of an acidic salt in aqueous solution is the presence of hydrogen ions.
The other options do not define an acidic salt correctly.
Hence, the correct choice is the one that states hydrogen ions are present in the aqueous solution.
Answer:C. hydrogen ions in its aqueous solution