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Standard X

Chemistry

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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Similar questions

Q. Sodium carbonate extract of the salt is acidified with

d i l . H N O_{3}

and

A g N O_{3}

solution is added to it. A yellow yellow precipitate insoluble in excess

N H_{4} O H

confirms the presence of :

Q. A black coloured compound

(A)

on reaction with dilute

H_{2} S O_{4}

gives a gas

(B)

which on passing in a solution of an acid

(C)

gives a white turbidity

(D)

. Gas

(B)

when passed in an acidified solution of a compound

(E)

gives a precipitate

(F)

soluble in dil.

H N O_{3}

. After boiling this solution when an excess of

N H_{4} O H

is added, a blue coloured compound

(G)

is formed. To this solution on addition of acetic acid and aqueous

K_{4} [F e (C N)_{6}]

a chocolate precipitate

(H)

is obtained. On addition of an aqueous soluion of

B a C l_{2}

to an aqueous solution of

(E)

, a white precipitate insoluble in

H N O_{3}

is obtained. Identify

(G)

and

(H)

Q. A sodium salt of an organic acid ‘X’ produces effervescence with conc.

H_{2} S O_{4}

. ‘X’ reacts with the acidified aqueous

C a C l_{2}

solution to give a white precipitate which decolourises an acidic solution of

K M n O_{4}

. ‘X’ is:

A black colored compound (A) on reaction with dilute

H_{2} S O_{4}

gives a gas (B) which on passing in a solution of acid (C) gives white turbidity (D). Gas (B) when placed in an acidified solution of a compound (E) gives a precipitate (F) soluble in dilute

H N O_{3} .

After boiling this solution, when an excess of

N H_{4} O H

is added, blue colored compound (G) is formed. To this solution on addition of

C H_{3} C O O H

and aqueous

K_{4} [F e (C N)_{6}]

, a chocolate precipitate (H) is obtained. On the addition of an aqueous solution of

B a C l_{2}

to an aqueous solution of E, a white ppt insoluble in

H N O_{3}

is obtained.

Identify B.

Q. A sodium salt of an organic acid ‘X’ produces effervescence with conc.

H_{2} S O_{4}

. ‘X’ reacts with the acidified aqueous

C a C l_{2}

solution to give a white precipitate which decolourises an acidic solution of

K M n O_{4}

. ‘X’ is:

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Aqueous solution or sodium carbonate extract of the salt is acidified with acetic acid . On addition of BaCl2 to it ,a white precipitate is formed which is insoluble in conc. HCl or conc. HNO3. This indicates the presence of:

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: