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The gas liberated on heating a mixture of two salts with $N a O H$ , gives a reddish brown precipitate with an alkaline solution of $K_{2} {H g I}_{4}$ . The aqueous solution of the mixture on treatment with ${B a C l}_{2}$ gives a white precipitate which is sparingly soluble in conc. $H C l$ . On heating the mixture with $K_{2} {C r}_{2} O_{7}$ an conc. $H_{2} {S O}_{4}$ , red vapours (A) are produced. The aqueous solution of the mixture gives a deep blue colouration (B) with potassium ferricyanide solution. The radicals in the given mixture are $F e^{2 +}, N H_{4}^{+}; S O_{4}^{2 +}, C l^{-}$ (A) : $C r O_{2} C l_{2}$ .

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Solution

The gas liberated on heating a mixture of two salts with $N a O H$ , gives a reddish brown precipitate with an
alkaline solution of $K_{2} {H g I}_{4}$ .
This confirms presence of ammonium ion.
$2 K_{2} H g I_{4} + 4 K O H + N H_{4} \to H g_{2} O N H_{2} I ↓ + 7 K I + C l^{-} + 3 H_{2} O$
$i o d i d e o f m i l l o n^{'} s b a s e, b r o w n p p t$
The aqueous solution of the mixture on treatment with ${B a C l}_{2}$ gives a white precipitate which is
sparingly soluble in conc. $H C l$ .
This confirms presence of sulphate ions.
$B a C l_{2} + S O_{4}^{2 -} \to B a S O_{4} ↓ (w h i t e) + 2 C l^{-}$
On heating the mixture with $K_{2} {C r}_{2} O_{7}$ an conc. $H_{2} {S O}_{4}$ , red vapours of chromyl chloride are produced.
This confirms the presence of chloride ions.
$K_{2} C r_{2} O_{7} + 4 C l^{-} + 6 H_{2} S O_{4} \to 2 K H S O_{4} + 4 H S O_{4}^{-} + 2 C r O_{2} C l_{2} \to (c h r o m y l c h l o r i d e)$
The aqueous solution of the mixture gives a deep blue colouration, $K F e^{I I} [F e^{I I I} (C N)_{6}]$ , Turnbull's blue with
potassium ferricyanide solution.
$F e S O_{4} (C) + K_{3} [F e (C N)_{6}] ⟶ K F e^{I I} [F e^{I I I} (C N)_{6}] (H), T u r n b u l l^{'} s b l u e$

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Similar questions

N a O H

K_{2} H g l_{4}

B a C l_{2}

H C l

K_{2} C r_{2} O_{7}

H_{2} S O_{4}

(A)

(B)

M n O_{2}

H_{2} S O_{4}

K_{2} [H g I_{4}]

K_{2} [{H g I}_{4}]

K_{3} [{F e (C N)}_{6}]

{B a C l}_{2}

F e S O_{4} . (N H_{4})_{2} S O_{4} . 6 H_{2} O

H_{2} S

P b (N O_{3})_{3}

P b C l_{2}

P b S

P b I_{2}

B a C l_{2}

H C l

N a O H

N a O H

N a C l O_{4}

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