The salt of alkali metal gives violet colour in the flame test. Its aqueous solution gives a white precipitate with barium chloride in hydrochloric acid medium. The salt is

Options

A. `K_(2)SO_(4)`
B. `KCl`
C. `Na_(2)SO_(4)`
D. `K_(2)CO_(3)`

Answer

A

Explanation

K imparts violet colour to the flame and `SO_(4)^(2-)` ions produce white ppt. of `BaSO_(4)` when treated `K_(2)SO_(4) + BaCl_(2) to underset("White ppt.")(BaSO_(4)) darr + 2 KCl` with an aqueous solution of `BaCl_(2)` . Thus , option (a) is correct .