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  4. 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

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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

KEAMKEAM 2014The s-Block Elements

Solution:

The salt gives violet colour in the flame test, which shows the presence of potassium ion $\left( K ^{+}\right)$ in it. Further, the aqueous solution of salt gives white precipitate with $BaCl _{2}$ in acidic medium, so it must contain sulphate ion $\left( SO _{4}^{2-}\right)$ and the precipitate is of $BaSO _{4}$.

Thus, the salt is

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