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Test for Sulphuric Acid

Aqueous solut...

Question

Aqueous solution or sodium carbonate extract of the salt is acidified with acetic acid . On addition of $B a C l_{2}$ to it ,a white precipitate is formed which is insoluble in conc. $H C l$ or conc. $H N O_{3}$ . This indicates the presence of:

C O_{3}^{2 -}

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N O_{3}^{-}

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S O_{4}^{2 -}

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C l^{-}

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Solution

The correct option is C $S O_{4}^{2 -}$
Confirmatory Test for $S O_{4}^{2 -}$ :
Aqueous solution or sodium carbonate extract of the salt is acidified with acetic acid . On addition of barium chloride gives a white precipitate of barium sulphate i.e. $B a S O_{4}$
Barium sulphate is insoluble in conc. $H C l$ or conc. $H N O_{3}$
Reaction:
$N a_{2} S O_{4} + B a C l_{2} \to B a S O_{4} White ppt. + 2 N a C l$
Sulphate ions give white precipitate of lead sulphate when aqueous solution or sodium carbonate extract is neutralised with acetic acid is treated with lead acetate solution
$N a_{2} S O_{4} + (C H_{3} C O O)_{2} P b \to P b S O_{4} White ppt. + C H_{3} C O O N a$

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