Mark the correct statement out of the following

In qualitative inorganic analysis, basic radicals (cations) are systematically identified by precipitating them as specific compounds using particular reagents.

Let's examine the statements to mark the correct statement:

1. Group I basic radicals precipitate as chlorides:

Group I cations, such as silver (Ag⁺), lead (Pb²⁺), and mercury(I) (Hg₂²⁺), are precipitated as their chlorides when treated with dilute hydrochloric acid (HCl). This occurs because the solubility products of their chlorides (AgCl, PbCl₂, and Hg₂Cl₂) are low, leading to precipitation.

2. Group IV basic radicals precipitate as sulphides:

Group IV cations, including zinc (Zn²⁺), nickel (Ni²⁺), cobalt (Co²⁺), and manganese (Mn²⁺), precipitate as sulphides when exposed to hydrogen sulphide (H₂S) in an ammoniacal medium. The increased sulphide ion concentration causes these cations to form insoluble sulphides like ZnS and NiS.

3. Group V basic radicals precipitate as carbonates:

Group V cations, such as barium (Ba²⁺), calcium (Ca²⁺), and strontium (Sr²⁺), precipitate as carbonates upon the addition of ammonium carbonate ((NH₄)₂CO₃) in a basic medium. This reaction forms insoluble carbonates like BaCO₃ and SrCO₃.

Given that all three statements accurately describe the precipitation behavior of their respective groups, the correct choice is:

d. All of the above statements are correct.