In Aqueous solution, metal ion M_(1) reacts separately with reagents Q and R in excess to give tetrahedral and square planar complexes respectively. An aqueous solution of another metal ion M_(2) always froms tetrahedral complexes with these reagents. Aqueous solution of M_(2) on reaction with reagent S gives white precipitate which dissolves in excess of S. The reactions are summarized in the scheme given ahead Reagent S is

In Aqueous solution, metal ion M_(1) reacts separately with reagents Q

1.	In Aqueous solution, metal ion M_(1) reacts separately with reagents Q and R in excess to give tetrahedral and square planar complexes respectively. An aqueous solution of another metal ion M_(2) always froms tetrahedral complexes with these reagents. Aqueous solution of M_(2) on reaction with reagent S gives white precipitate which dissolves in excess of S. The reactions are summarized in the scheme given ahead Reagent S is
Answer» `K_(4)[Fe(CN)_(6)]` `Na_(2)HPO_(4)` `K_(2)CrO_(4)` `KOH Solution :REAGENT (S) is KOH