In a Lassaigne's test for sulphur in an organic compound,the purple colour formed with sodium nitroprusside solution is due to the formation of:

  • A
    $[Fe(CN)_5NOS]^{4-}$
  • B
    $[Fe(CN)_5S]^{2-}$
  • C
    $[Fe(CN)_5NOS]^{2-}$
  • D
    $[Fe(CN)_6]^{4-}$

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Similar Questions

The Lassaigne's extract is boiled with dilute $HNO_3$ before testing for halogens because,

Which of the following compounds will give a positive Lassaigne's test for both nitrogen and halogen?

In the Lassaigne sodium fusion test,$N$ and $S$ of an organic compound are converted into:

During the fusion of an organic compound with sodium metal,the nitrogen present in the organic compound is converted into:

Match the organic compounds in column $I$ with the Lassaigne's test results in column $II$ appropriately.
Column $I$ Column $II$
$A$. Aniline $i$. Red colour with $FeCl_3$
$B$. Benzene sulfonic acid $ii$. Violet colour with sodium nitroprusside
$C$. Thiourea $iii$. Blue colour with hot and acidic solution of $FeSO_4$

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