The salt of an 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

Question

The salt of an 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 (A)  K2SO4 (B) KCl (C) Na2SO4 (D) K2CO3

Tardigrade Admin · Accepted Answer

The salt gives violet colour in the flame test, which shows the presence of potassium ion

(K^{+})

in it. Further, the aqueous solution of salt gives white precipitate with

B a C l_{2}

in acidic medium, so it must contain sulphate ion

(S O_{4}^{2 -})

and the precipitate is of

B a S O_{4}

.

Thus, the salt is

Q. The salt of an 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

$K_{2} S O_{4}$

KCl

$N a_{2} S O_{4}$

$K_{2} C O_{3}$

$L i_{2} S O_{4}$

Q. The salt of an 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

K2​SO4​

KCl

Na2​SO4​

K2​CO3​

Li2​SO4​

The salt gives violet colour in the flame test, which shows the presence of potassium ion (K+) in it. Further, the aqueous solution of salt gives white precipitate with BaCl2​ in acidic medium, so it must contain sulphate ion (SO42−​) and the precipitate is of BaSO4​. Thus, the salt is

$K_{2} S O_{4}$

$N a_{2} S O_{4}$

$K_{2} C O_{3}$

$L i_{2} S O_{4}$