A salt with few drops of conc. HCl gives apple green colour in flame test. The group precipitate of the salt is dissolved in acetic acid and treated with K₂CrO₄ to give yellow precipitate. When the sodium carbonate extract of the salt solution is heated with conc. HNO₃ and ammonium molybdate, it resulted a canary yellow precipitate. The cation and anion present in the salt are respectively,

Step-by-step solution

An apple green colour in the flame test indicates the presence of Ba²⁺ ion. The group precipitate of Ba²⁺ is BaCO₃ , which dissolves in acetic acid to form barium acetate. Upon treatment with K₂CrO₄ , it gives a yellow precipitate of barium chromate ( BaCrO₄ ), confirming the presence of Ba²⁺ . When the sodium carbonate extract is heated with conc. HNO₃ and ammonium molybdate, the formation of a canary yellow precipitate indicates the presence of phosphate ( PO₄³⁻ ) ion. The canary yellow precipitate is ammonium ph