The type of salt formed by partial replacement of replaceable hydrogen ion of an acid by a basic radical is ____.

The salts formed by partial replacement of replaceable hydrogen ions of an acid by a basic radical is called an acid salt. An acid salt still contain hydrogen ions that can be replaced.  For example, 
 
NaOH + H₂SO₄ $\to$NaHSO₄ + H₂O

​NaHSO₄ is an acid salt.