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Reaction with Bases

A mixture con...

Question

A mixture containing two salts was treated as follows:
(i)The mixture on heating with $M n O_{2}$ and concentrated $H_{2} S O_{4}$ liberates a yellowish green gas.
(ii)The mixture on boiling with potassium hydroxide liberates a gas which when bubbled through an alkaline solution of $K_{2} [H g I_{4}]$ gives brown precipitate.
(iii)The mixture on reaction with potassium thiocyanate gives deep red colouration.
The given mixture contains :

F e (C H_{3} C O O)_{3}

and

C H_{3} C O O N H_{4}

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F e C l_{3}

and

N H_{4} C l

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H g C l_{2}

and

N H_{4} C l

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M g (C H_{3} C O O)_{2}

and

N H_{4} C l

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Solution

The correct option is B $F e C l_{3}$ and $N H_{4} C l$
(i) Ammonium chloride on heating with $M n O_{2}$ and concentrated $H_{2} S O_{4}$ liberates a yellowish green chlorine gas. This test is used for the confirmation of chloride ions in the salt.
$N H_{4} C l + M n O_{2} + H_{2} S O_{4} \to (N H_{4})_{2} S O_{4} + M n S O_{4} + H_{2} O + C l_{2} ↑ (yellowish green gas)$

(ii) Ammonium chloride on boiling with potassium hydroxide liberates ammonia gas which when bubbled through an alkaline solution of potassium tetraiodomercurate(II) gives brown precipitate of basic mercury(II) amido iodine complex.
$N H_{4} C l + 2 K O H \to N a_{2} S O_{4} + H_{2} O + N H_{3} ↑$
$K_{2} [H g I_{4}] + N H_{3} + 3 K O H \to H g O . H g (N H_{2}) I ↓ (brown ppt.) + 7 K I + 2 H_{2} O$

(iii) $F e C l_{3}$ on reaction with potassium thiocyanate gives deep red colouration/precipitate of ferric thiocyanate.
$F e C l_{3} + 3 K S C N \to F e (S C N)_{3} ↓ (deep red ppt.) + 3 K C l$
The mixture contains $F e C l_{3}$ and $N H_{4} C l$

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