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Naresh Tandon
Asked: 2022-11-10T02:34:20+05:30 In:

The salt of an alkali metal gives yellow colour in the flame test . Also its aqueous solution gives an insoluble white precipitate with barium chloride in acid medium . The salt is
A. NaCl
B. `K_(2)SO_(4)`
C. `Na_(2)SO_(4)`
D. `Li_(2)SO_(4)`

The salt of an alkali metal gives yellow colour in the flame test . Also its aqueous solution gives an insoluble white precipitate with barium chloride in acid medium . The salt is
A. NaCl
B. `K_(2)SO_(4)`
C. `Na_(2)SO_(4)`
D. `Li_(2)SO_(4)`
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1 Answer

  1. Correct Answer – C
    Since the alkali metal salt gives a yellow colour in the flame , it must be sodium salt . Further , since the salt gives an insoluble white ppt. with `BaCl_(2)` in acidic medium , it must be sodium sulphate , `Na_(2)SO_(4)`.
    `Na_(2)SO_(4) + BaCl_(2) to underset(“White ppt.”)(BaSO_(4)) darr + 2 NaCl`

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