The gas evolved by heating potassium ferrocyanide crystals with conc.H2SO4 is :
A
CO
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B
CO2
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C
SO2
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D
SO3
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Solution
The correct option is ACO Reaction:
Potassium hexacyanoferrate(II) react with sulfuric acid and water to produce potassium sulfate, iron(II) sulfate, ammonium sulfate and carbon monoxide. Sulfuric acid - concentrated solution. The reaction takes place in a boiling solution.