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Copper II Chloride

A white powde...

Question

A white powder when strongly heated gives off brown fumes. A solution of this powder gives a yellow precipitate with a solution of $K I$ . When a solution of barium chlorine is added to solution of powder, a white precipitate results. This white powder may be:

A

B a (N O_{3})_{2}

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B

A g N O_{3}

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C

K B r or N a B r

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D

A soluble sulphate

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Solution

The correct option is B $A g N O_{3}$
This white powder may be $A g N O_{3}$
As the compound gives brown fumes the anion is nitrate and compound reacts with $K I$ and barium chloride then the cation will be $A g^{+}$ .
$2 A g N O_{3} Δ ⟶ 2 A g + 2 N O_{2} ↑ + O_{2} ↑$
$(Brown)$
$A g N O_{3} (aq) + K I (aq) ⟶ A g I ↓ + K N O_{3} (aq)$
$(Yellow ppt)$
$2 A g N O_{3} (aq) + B a C l_{2} (aq) ⟶ 2 A g C l ↓ + B a (N O_{3})_{2}$
$(White ppt)$
$A g C l$ is also soluble in $N H_{3} (aq)$ .
$A g C l + 2 N H_{3} \to A g (N H_{3})_{2} C l (Soluble complex)$

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