In the given salt cation is called as basic radical and anion is called as acid radical. Why?

PLACEHOLDER ANSWER - the answer is an explanation. A salt is formed by the neutralisation of an acid with a base. The cation comes from the base (for example $$\text{Na}^+$$ from NaOH), so it is called the basic radical, and the anion comes from the acid (for example $$\text{Cl}^-$$ from HCl), so it is called the acid radical.