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Detection of Elements: Lassaigne's Test - Detection of Sulfur

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Estimated time: 3 minutes
CBSE: Class 12

Key Points: Detection of Sulfur

Test 1 — Sodium nitroprusside test:

  • SFE + sodium nitroprusside → Deep violet colour confirms sulfur
  • S²⁻ + [Fe(CN)₅NO]²⁻ → [Fe(CN)₅NOS]⁴⁻ (violet)

Test 2 — Lead acetate test:

  • SFE + acetic acid → acidify + Pb(CH₃COO)₂ → Black precipitate (PbS) confirms sulfur
  • Pb(CH₃COO)₂ + S²⁻ → PbS↓ + 2CH₃COO⁻
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