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Extraction of Aluminium

Which of foll...

Question

Which of following mixture will give green precipitate?
(I) $K M n O_{4} + K O H (a q .)$ (highly basic medium)
(II) $C u S O_{4} + K_{3} [F e {(C N)}_{6}]$
(III) $H g_{2} C l_{2} + K I$
(IV) $F e C l_{3} (a q .) + H_{2} S$

I and II

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I and IV

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II and III

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None of the above

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Solution

The correct option is D None of the above
(I) On heating with strong basic medium, potassium permanganate gives black precipitate of manganese dioxide, with evolution of oxygen gas.
$2 K M n O_{4} + K O H (a q .) (highly basic medium) \to K_{2} M n O_{4} + M n O_{2} ↓ (black ppt.) + 2 O_{2} ↑$
(II) Copper reacts with potassium ferrocyanide, forming red-brown coloured complex of copper ferrocyanide.
$C u S O_{4} + K_{3} [F e (C N)_{6}] \to C u_{2} [F e (C N)_{6}] ↓ + 2 K_{2} S O_{4}$
(III) Mercuric chloride reacts with potassium iodide to form reddish precipitate of $H g I_{2}$ .
$H g_{2} C l_{2} + K I \to H g I_{2} ↓ + 2 K C l$
(IV) Ferric chloride reacts with hydrogen sulphide to form black coloured compound,ferric sulphide.
$2 F e C l_{3} + 3 H_{2} S \to F e_{2} S_{3} (black coloured) + 6 H C l$

Suggest Corrections

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