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The prussian blue colour obtained during...

The prussian blue colour obtained during the test for nitrogen by Lassaigne.s test is due to the formation of

A

`Fe[Fe(CN)_(6)]_(3)`

B

`Na_(3)[Fe(CN)_(6)]`

C

`Fe(CN)_(3)`

D

`Na_(4)[Fe(CN)_(6)NOS]`

Text Solution

Verified by Experts

The correct Answer is:
D
`Na_(4)[Fe(CN)_(6)NO_(5)]` blue
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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. 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)