Lassaigne's test is used for detection o...

Lassaigne's test is used for detection of elements N, S, X and P. The sodium fused extract is tested for these elements with appropriate reagents. The observation made in to identify the element present in the organic compound.
The sodium fusion extrat is treated with `FeSO_(4)`, followed by `H_(2)SO_(4)`, gave blue colour. The element present in the compound is

sulphur

nitrogen

chlorine

Phosphorus

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The correct Answer is:

In Lassaigne.s test, organic compound containing only N gives purussian Blue colour.

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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. In the process of testing elements in Lassaigne's a test, which of the following reactions do not occur.

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