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Nitrogen, sulphur and halogens are teste...

Nitrogen, sulphur and halogens are tested from the sodium fusion extract of the organic compound which is commonly known as Lassaigne's extract. For preparing Lassaigen's extract, a small quanty of the organic compound is fused with sodium metal in a fusion tube. The red tube is broken in distilled water, boiled and filtered. This filtrate is known as Lassaigne's extract or sdodium fusion extract.
In the process of testing elements in Lassaigne's a test, which of the following reactions do not occur.

A

`Na_(2)[Fe(CN)_(5)S]`

B

`Na_(2)[Fe(CN)_(2)NO]`

C

`Na_(2)[Fe(CN)_(6)]`

D

`Na_(4)[Fe(CN)_(5)NOS]`

Text Solution

Verified by Experts

The correct Answer is:
D
The violet colour indicating the presence of S in the compound is due to the formation of sodium thio nitroprusside
`Na_(4)[Fe(CN)_(5)NOS]`.
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Nitrogen, sulphur and halogens are tested from the sodium fusion extract of the organic compound which is commonly known as Lassaigne's extract. For preparing Lassaigen's extract, a small quanty of the organic compound is fused with sodium metal in a fusion tube. The red tube is broken in distilled water, boiled and filtered. This filtrate is known as Lassaigne's extract or sdodium fusion extract. Which of the following is not applicable to Lassaigne's test

Nitrogen, sulphur and halogens are tested from the sodium fusion extract of the organic compound which is commonly known as Lassaigne's extract. For preparing Lassaigen's extract, a small quanty of the organic compound is fused with sodium metal in a fusion tube. The red tube is broken in distilled water, boiled and filtered. This filtrate is known as Lassaigne's extract or sdodium fusion extract. During testing of nitrogen in organic compound by Lassaigne's test, which of the following compounds are formed. (i) NaCN (ii) Fe_(4)[Fe(CN)_(6)]_(3) (iii) Na_(4)[Fe(CN)_(6)] (iv) Fe_(3)[Fe(CN)_(6)]_(4)

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