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Standard X

Chemistry

Precipitation Reaction

Precipitate Q...

Question

Precipitate (Q) was treated with dil. HCl and coloured solution was obtained. On passing $H_{2} S$ gas into this solution no precipitate was obtained but colour of the solution changes, then cation present in the precipitate (Q) can be identified by :

N a_{2} S_{2} O_{3}

solution

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K I + s t a r c h

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

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A l l

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Solution

The correct option is D $A l l$
Fe(OH)3 showing change in colour.

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Similar questions

Q. The aqueous solution of inorganic compound

(X)

yielded a white precipitate when treated with dilute

H N O_{3}

and

A g N O_{3}

. Another sample of the solution of

(X)

when treated with

N a O H

gave a white precipitate first which dissolved in excess of

N a O H

yielding a colorless solution. When

H_{2} S

gas was passed through that solution a white precipitate was obtained.

Identify the compound

(X)

and give the reactions.

An aqueous solution of a mixture of two inorganic salts, when treated with dilute

H C l

, gave a precipitate (P) and filtrate (Q). The precipitate P was found to dissolve in hot water.

The filtrate (Q) remained unchanged, when treated with

H_{2} S

in dilute mineral acid medium. However, it gave a precipitate (R) with

H_{2} S

in an ammoniacal medium. The precipitate R gave a coloured solution (S ), when treated with

H_{2} O_{2}

in an aqueous NaOH medium.

The coloured solution S contains:

Q. In qualitative analysis when

H_{2} S

is passed through an aqueous solution of salt acidified with dil. HCl, a black precipitate is obtained. On boiling the precipitate with dil.

H N O_{3}

it forms a solution of blue colour. Addition of excess of aqueous solution of ammonia to this solution gives._____.

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) (yellow coloured solution) changes to light green coloured solution (B) on passing

H_{2} S

gas. (A) and (B) both give white precipitate with

B a {C l}_{2}

solution, insoluble in conc.

H C l

. A gives blue coloured ppt (C) with

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

, (B) does not. Here,
(A) :

{F e C l}_{3}

(B) :

{F e C l}_{2}

F e_{4} [F e (C N_{6})]_{3}

If true enter 1, else enter 0.

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Precipitate (Q) was treated with dil. HCl and coloured solution was obtained. On passing H2S gas into this solution no precipitate was obtained but colour of the solution changes, then cation present in the precipitate (Q) can be identified by :

The correct option is D AllFe(OH)3Fe(OH)3 showing change in colour.

Precipitate (Q) was treated with dil. HCl and coloured solution was obtained. On passing $H_{2} S$ gas into this solution no precipitate was obtained but colour of the solution changes, then cation present in the precipitate (Q) can be identified by :

The correct option is D $A l l$
Fe(OH)3 showing change in colour.