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ChemistryNEET 2023Qualitative and quantitative analysis

Purification and Characterisation of Organic Compounds

In the Lassaigne's extract of an organic compound, both nitrogen and sulphur are present, which gives a blood-red colour with Fe3+\mathrm{Fe^{3+}} due to the formation of:

  1. A.Fe4[Fe(CN)6]3⋅xH2O\mathrm{Fe_4[Fe(CN)_6]_3 \cdot xH_2O}
  2. B.NaSCN
  3. C.[Fe(CN)5NOS]4−\mathrm{[Fe(CN)_5NOS]^{4-}}
  4. D.[Fe(SCN)]2+\mathrm{[Fe(SCN)]^{2+}}✓

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