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Standard XII

Chemistry

Central Atom and Ligands

Colourless sa...

Question

Colourless salt $A$ decolorises $I_{2}$ solution and gives white precipitate (changing to black) with $A g N O_{3}$ solution. $A$ also changes $F e C l_{3}$ (yellow) solution to $F e C l_{2}$ (green). Identify $A$ ?

N a_{2} S O_{3}

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N a_{2} S O_{4}

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

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None of the above

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Solution

The correct option is C $N a_{2} S_{2} O_{3}$
Colourless salt $A$ decolorises $I_{2}$ solution and gives white precipitate (changing to black) with $A g N O_{3}$ solution. $A$ also changes $F e C l_{3}$ (yellow) solution to $F e C l_{2}$ (green).
Hence, $A$ is $N a_{2} S_{2} O_{3}$ .
$N a_{2} S_{2} O_{3} + 2 A g N O_{3} ⟶ A g_{2} S_{2} O_{3} w h i t e p p t ↓ + 2 N a N O_{3}$
$A g_{2} S_{2} O_{3} + H_{2} O ⟶ H_{2} S O_{4} + A g_{2} S b l a c k ↓$
$2 F e C l_{3} y e l l o w + 2 N a_{2} S_{2} O_{3} ⟶ 2 F e C l_{2} g r e e n + N a_{2} S_{4} O_{6} + 2 N a C l$

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Similar questions

Q. A colorless salt

A

decolorizes the color of

I_{3}^{⊖}

. Solution of

A

on treatment with

A g N O_{3}

gives white precipitate. The compound

A

turns

F e C l_{3}

solution (yellow) to

F e C l_{2}

solution (green). Identify

A

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. (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.

Q. Assertion :On adding zinc pieces to aqueous

F e {C l}_{3}

solution, colour changes from deep yellow to light green. Reason: Aqueous

F e {C l}_{3}

is acidic and on adding

Z n

nascent hydrogen is produced which reduces deep yellow

F e {C l}_{3}

solution to light green

F e {C l}_{2}

solution.

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

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Colourless salt A decolorises I2 solution and gives white precipitate (changing to black) with AgNO3 solution. A also changes FeCl3 (yellow) solution to FeCl2 (green). Identify A?

Colourless salt $A$ decolorises $I_{2}$ solution and gives white precipitate (changing to black) with $A g N O_{3}$ solution. $A$ also changes $F e C l_{3}$ (yellow) solution to $F e C l_{2}$ (green). Identify $A$ ?