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Question

Choose the ion whose aqueous solution is violet colour:


A

FeCN64-

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B

FeSCN3

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C

FeCN5NOS4-

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D

FeCN63-

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Solution

The correct option is C

FeCN5NOS4-


Explanation for the correct option:

(C). The presence of Sulphur in organic compound is detected by fusing the unknown organic compound with sodium in Lassaigne's extract.

2Na+SNa2S

The final confirmation of sulfide in formed product is identified by reacting with sodium nitroprusside solution. The inference of violet colour confirms the presence of sulphur.

S-2+Fe(CN)5NO-2Fe(CN)5NOS-4

Explanation for the incorrect option:

A. FeCN64-is used for the detection of Fe3+ions. It gives Prussian blue colour. Hence option (A) is incorrect.

B. Red blood colour is given by a complex FeSCN3. It detects the presence of sulfurS and nitrogenN simultaneously. Hence option (B) is incorrect.

D. FeCN63-used for the detection of Fe2+ions. It forms a blue precipitate. Hence option (D) is incorrect.

Hence option (C) is correct.


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