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Qualitative Analysis> Systematic Analysis of Anions

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Estimated time: 5 minutes
CBSE: Class 12

Key Points: Systematic Analysis of Anions

Group A (Dil. H₂SO₄ Test):

Observation Gas Anion
Colourless, odourless gas; turns lime water milky CO₂ CO₃²⁻, HCO₃⁻
Colourless gas, sulphur smell; turns K₂Cr₂O₇ paper green SO₂ SO₃²⁻
Colourless gas, rotten egg smell; turns lead acetate paper black H₂S S²⁻
Pungent reddish-brown gas; turns starch-iodide paper blue NO₂ NO₂⁻
Colourless gas, vinegar smell CH₃COOH CH₃COO⁻

Group B (Conc. H₂SO₄ Test):

Observation Gas Anion
White fumes with a glass rod dipped in NH₃; pungent smell HCl Cl⁻
Reddish-brown fumes; intensity increases with MnO₂ Br₂ Br⁻
Violet vapours; turn starch paper blue I₂ I⁻
Brown fumes; increase with Cu turnings; + FeSO₄ + H₂SO₄ → brown ring NO₂ NO₃⁻
Colourless gas turns lime water milky; burns with blue flame at CaCl₂ C₂O₄²⁻ gas C₂O₄²⁻

Group III Anions (SO₄²⁻, PO₄³⁻): No gas with dil. HCl or conc. H₂SO₄ → detected by precipitation.

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