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The salt of an alkali metal gives violet...

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

`K _(2) SO _(4)`

B

`KCl`

C

`Na _(2) SO _(4)`

D

`K_(2)CO_(3)`

Text Solution

Verified by Experts

The correct Answer is:
A
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 `BaCl_(2)` in acidic medium, so it must contain sulphate ion `(SO_(4) ^(2-))` and the precipitate is of `BaSO_(4).`
Thus, the salt is
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