On heating K₄Fe(CN)₆ with conc. H₂SO₄ gives the gas

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SO₂

CO₂

NO₂

answer is C.

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Detailed Solution

Potassium hexacyanoferrate(II) react with sulfuric acid and water to produce potassium sulfate, iron(II) sulfate, ammonium sulfate and carbon monoxide.

K₄Fe(CN)₆+ 6H2SO₄+ 6H₂O → 2K₂SO₄ + FeSO₄+ 3(NH₄)₂SO₄ + 6CO

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