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Standard XII

Chemistry

Lead Acetate

A white colou...

Question

A white coloured inorganic salt gives the following reactions.

(i) It is soluble in water and the solution has sweet taste.
The solution turns black in presence of $H_{2} S$
ii) The solution gives a white precipitate with dilute HCl which is soluble in hot water.

iii) The salt when heated gives acetone and a yellow coloured residue. Identify the salt (A) and give chemical reactions.

NaCl

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Sn(HCOO)₂

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Pb(CH₃COO)₂

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CaCO₃

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Solution

The correct option is C
Pb(CH₃COO)₂

$(A) i s P b (C H_{3} C O O)_{2} P b (C H_{3} C O O)_{2} + H_{2} S \to P b S + 2 C H_{3} C O O H Black P b (C H_{3} C O O)_{2} + 2 H C l \to P b C l_{2} + 2 C H_{3} C O O H Soluble in hot water P b (C H_{3} C O O)_{2} \to P b O + C O_{2} + C H_{3} C O C H_{3}]$

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Similar questions

A white coloured inorganic salt gives the following reactions.

(i) It is soluble in water and the solution has sweet taste.
The solution turns black in presence of $H_{2} S$
ii) The solution gives a white precipitate with dilute HCl which is soluble in hot water.

iii) The salt when heated gives acetone and a yellow coloured residue. Identify the salt (A) and give chemical reactions.

Q. The aqueous solution of an unknown sodium salt gives the following reactions.
I. It decolorises a solution of iodine in potassium iodide.
II. It gives white turbidity with

d i l . H C l

solution.
III. It gives a white precipitate with

A g N O_{3}

solution which changes colours and finally becomes black no standing.
The unknown sodium salt is :

Q. Identify the inorganic salt

A

whose aqueous solution gives following reactions.
(i) pale yellow precipitate with

A g N O_{3}

solution, insoluble in dil

H N O_{3}

(ii) white precipitate with

N H_{4} O H

and also with

N a O H

solution. However the precipitate does not dissolve in excess of

N H_{4} O H

but soluble in excess of

N a O H

Q. Identify the salts

P

and

Q

from the observations given below:
On performing the flame test salt

P

produces a lilac coloured flame and its solution gives a white precipitate with silver nitrate solution, which is soluble in Ammonium hydroxide solution.

Q. A coloured precipitate is obtained when

H_{2} S

gas is passed through an aqueous solution of a salt in the presence of ammonium hydroxide. The precipitate dissolves in dilute

H C l

and reacts with

N a O H

to give white precipitate which on standing turns into a brown/black mass. The brown/black mass on fusion with

K N O_{3}

and

N a_{2} C O_{3}

gives green mass. The cation of the salt is:

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The correct option is C Pb(CH3COO)2 (A)isPb(CH3COO)2Pb(CH3COO)2+H2S→PbS+2CH3COOH BlackPb(CH3COO)2+2HCl→PbCl2+2CH3COOH Soluble in hot waterPb(CH3COO)2→PbO+CO2+CH3COCH3]